| Abidjan | is 4 hours ahead of Ottawa |
| Abu Dhabi | is 8 hours ahead of Ottawa |
| Abuja | is 5 hours ahead of Ottawa |
| Acapulco | is 2 hours behind Ottawa |
| Accra | is 4 hours ahead of Ottawa |
| Adak | is 5 hours behind Ottawa |
| Adamstown | is 4 hours behind Ottawa |
| Addis Ababa | is 7 hours ahead of Ottawa |
| Adelaide | is 14 hours, 30 minutes ahead of Ottawa |
| Aden | is 7 hours ahead of Ottawa |
| Agra | is 9 hours, 30 minutes ahead of Ottawa |
| Aguascalientes | is 2 hours behind Ottawa |
| Ahmedabad | is 9 hours, 30 minutes ahead of Ottawa |
| Akron | has no time difference with Ottawa |
| Al Jizah | is 6 hours ahead of Ottawa |
| Albany | has no time difference with Ottawa |
| Albuquerque | is 2 hours behind Ottawa |
| Alexandria | is 6 hours ahead of Ottawa |
| Algiers | is 5 hours ahead of Ottawa |
| Almaty | is 10 hours ahead of Ottawa |
| Alofi | is 7 hours behind Ottawa |
| Amman | is 7 hours ahead of Ottawa |
| Amsterdam | is 6 hours ahead of Ottawa |
| Anadyr | is 16 hours ahead of Ottawa |
| Anaheim | is 3 hours behind Ottawa |
| Anchorage | is 4 hours behind Ottawa |
| Andorra La Vella | is 6 hours ahead of Ottawa |
| Ankara | is 7 hours ahead of Ottawa |
| Anshan | is 12 hours ahead of Ottawa |
| Antalya | is 7 hours ahead of Ottawa |
| Antananarivo | is 7 hours ahead of Ottawa |
| Apia | is 18 hours ahead of Ottawa |
| Aqtau | is 9 hours ahead of Ottawa |
| Aqtobe | is 9 hours ahead of Ottawa |
| Arlington | is 1 hour behind Ottawa |
| Ashgabat | is 9 hours ahead of Ottawa |
| Asmara | is 7 hours ahead of Ottawa |
| Astana | is 10 hours ahead of Ottawa |
| Asuncion | is 1 hour ahead of Ottawa |
| Athens | is 7 hours ahead of Ottawa |
| Atlanta | has no time difference with Ottawa |
| Auckland | is 17 hours ahead of Ottawa |
| Augusta | has no time difference with Ottawa |
| Aurora | is 2 hours behind Ottawa |
| Austin | is 1 hour behind Ottawa |
| Azores | is 4 hours ahead of Ottawa |
| Baghdad | is 7 hours ahead of Ottawa |
| Baku | is 8 hours ahead of Ottawa |
| Balikpapan | is 12 hours ahead of Ottawa |
| Baltimore | has no time difference with Ottawa |
| Bamako | is 4 hours ahead of Ottawa |
| Bandar Seri Begawan | is 12 hours ahead of Ottawa |
| Bandung | is 11 hours ahead of Ottawa |
| Bangalore | is 9 hours, 30 minutes ahead of Ottawa |
| Bangkok | is 11 hours ahead of Ottawa |
| Bangui | is 5 hours ahead of Ottawa |
| Banjul | is 4 hours ahead of Ottawa |
| Baotou | is 12 hours ahead of Ottawa |
| Barcelona | is 6 hours ahead of Ottawa |
| Basel | is 6 hours ahead of Ottawa |
| Basra | is 7 hours ahead of Ottawa |
| Basse-Terre | has no time difference with Ottawa |
| Basseterre | has no time difference with Ottawa |
| Bastia | is 6 hours ahead of Ottawa |
| Baton Rouge | is 1 hour behind Ottawa |
| Beijing | is 12 hours ahead of Ottawa |
| Beirut | is 7 hours ahead of Ottawa |
| Belfast | is 5 hours ahead of Ottawa |
| Belgrade | is 6 hours ahead of Ottawa |
| Belmopan | is 2 hours behind Ottawa |
| Berlin | is 6 hours ahead of Ottawa |
| Bern | is 6 hours ahead of Ottawa |
| Bethlehem | is 7 hours ahead of Ottawa |
| Bhubaneshwar | is 9 hours, 30 minutes ahead of Ottawa |
| Billings | is 2 hours behind Ottawa |
| Birmingham (UK) | is 5 hours ahead of Ottawa |
| Birmingham (US) | is 1 hour behind Ottawa |
| Bishkek | is 10 hours ahead of Ottawa |
| Bismarck | is 1 hour behind Ottawa |
| Bissau | is 4 hours ahead of Ottawa |
| Bogota | is 1 hour behind Ottawa |
| Boise | is 2 hours behind Ottawa |
| Boston | has no time difference with Ottawa |
| Brades | has no time difference with Ottawa |
| Brampton | has no time difference with Ottawa |
| Brasilia | is 1 hour ahead of Ottawa |
| Bratislava | is 6 hours ahead of Ottawa |
| Brazzaville | is 5 hours ahead of Ottawa |
| Bridgetown | has no time difference with Ottawa |
| Brisbane | is 14 hours ahead of Ottawa |
| Brussels | is 6 hours ahead of Ottawa |
| Bucharest | is 7 hours ahead of Ottawa |
| Budapest | is 6 hours ahead of Ottawa |
| Buenos Aires | is 1 hour ahead of Ottawa |
| Buffalo | has no time difference with Ottawa |
| Bujumbura | is 6 hours ahead of Ottawa |
| Busan | is 13 hours ahead of Ottawa |
| Cairo | is 6 hours ahead of Ottawa |
| Calgary | is 2 hours behind Ottawa |
| Cali | is 1 hour behind Ottawa |
| Canberra | is 15 hours ahead of Ottawa |
| Cancun | is 1 hour behind Ottawa |
| Cape Town | is 6 hours ahead of Ottawa |
| Caracas | has no time difference with Ottawa |
| Cardiff | is 5 hours ahead of Ottawa |
| Carson City | is 3 hours behind Ottawa |
| Casablanca | is 4 hours ahead of Ottawa |
| Castries | has no time difference with Ottawa |
| Cayenne | is 1 hour ahead of Ottawa |
| Cebu City | is 12 hours ahead of Ottawa |
| Chandigarh | is 9 hours, 30 minutes ahead of Ottawa |
| Changchun | is 12 hours ahead of Ottawa |
| Changsha | is 12 hours ahead of Ottawa |
| Charleston | has no time difference with Ottawa |
| Charlotte | has no time difference with Ottawa |
| Charlottetown | is 1 hour ahead of Ottawa |
| Chatham Island | is 17 hours, 45 minutes ahead of Ottawa |
| Chelyabinsk | is 9 hours ahead of Ottawa |
| Chengdu | is 12 hours ahead of Ottawa |
| Chennai | is 9 hours, 30 minutes ahead of Ottawa |
| Cheyenne | is 2 hours behind Ottawa |
| Chicago | is 1 hour behind Ottawa |
| Chihuahua | is 3 hours behind Ottawa |
| Chittagong | is 10 hours ahead of Ottawa |
| Choibalsan | is 12 hours ahead of Ottawa |
| Chongqing | is 12 hours ahead of Ottawa |
| Christchurch | is 17 hours ahead of Ottawa |
| Cincinnati | has no time difference with Ottawa |
| Cleveland | has no time difference with Ottawa |
| Colombo | is 9 hours, 30 minutes ahead of Ottawa |
| Columbia | has no time difference with Ottawa |
| Columbus | has no time difference with Ottawa |
| Conakry | is 4 hours ahead of Ottawa |
| Concord | has no time difference with Ottawa |
| Copenhagen | is 6 hours ahead of Ottawa |
| Cordoba | is 6 hours ahead of Ottawa |
| Dakar | is 4 hours ahead of Ottawa |
| Dalian | is 12 hours ahead of Ottawa |
| Dallas | is 1 hour behind Ottawa |
| Damascus | is 7 hours ahead of Ottawa |
| Dar Es Salaam | is 7 hours ahead of Ottawa |
| Darwin | is 13 hours, 30 minutes ahead of Ottawa |
| Davos | is 6 hours ahead of Ottawa |
| Denpasar | is 12 hours ahead of Ottawa |
| Denver | is 2 hours behind Ottawa |
| Des Moines | is 1 hour behind Ottawa |
| Detroit | has no time difference with Ottawa |
| Dhaka | is 10 hours ahead of Ottawa |
| Dili | is 13 hours ahead of Ottawa |
| Djibouti | is 7 hours ahead of Ottawa |
| Dodoma | is 7 hours ahead of Ottawa |
| Doha | is 7 hours ahead of Ottawa |
| Douglas | is 5 hours ahead of Ottawa |
| Dover | has no time difference with Ottawa |
| Dubai | is 8 hours ahead of Ottawa |
| Dublin | is 5 hours ahead of Ottawa |
| Durban | is 6 hours ahead of Ottawa |
| Dushanbe | is 9 hours ahead of Ottawa |
| Dusseldorf | is 6 hours ahead of Ottawa |
| Easter Island | is 1 hour behind Ottawa |
| Edinburgh | is 5 hours ahead of Ottawa |
| Edmonton | is 2 hours behind Ottawa |
| El Aaiun | is 4 hours ahead of Ottawa |
| El Paso | is 2 hours behind Ottawa |
| Esfahan | is 8 hours, 30 minutes ahead of Ottawa |
| Fairbanks | is 4 hours behind Ottawa |
| Faisalabad | is 9 hours ahead of Ottawa |
| Fakaofo | is 18 hours ahead of Ottawa |
| Fernando De Noronha | is 2 hours ahead of Ottawa |
| Foochow | is 12 hours ahead of Ottawa |
| Fort Worth | is 1 hour behind Ottawa |
| Fort-de-France | has no time difference with Ottawa |
| Frankfort | has no time difference with Ottawa |
| Frankfurt | is 6 hours ahead of Ottawa |
| Freetown | is 4 hours ahead of Ottawa |
| Fresno | is 3 hours behind Ottawa |
| Fukuoka | is 13 hours ahead of Ottawa |
| Funafuti | is 16 hours ahead of Ottawa |
| Funchal | is 5 hours ahead of Ottawa |
| Fushun | is 12 hours ahead of Ottawa |
| Gaborone | is 6 hours ahead of Ottawa |
| Galapagos Islands | is 2 hours behind Ottawa |
| Gambier Islands | is 5 hours behind Ottawa |
| Gatineau | has no time difference with Ottawa |
| Gaza | is 7 hours ahead of Ottawa |
| Gdansk | is 6 hours ahead of Ottawa |
| Geneva | is 6 hours ahead of Ottawa |
| George Town(Cayman Islands) | is 1 hour behind Ottawa |
| Georgetown | has no time difference with Ottawa |
| Gibraltar | is 6 hours ahead of Ottawa |
| Glasgow | is 5 hours ahead of Ottawa |
| Guadalajara | is 2 hours behind Ottawa |
| Guam | is 14 hours ahead of Ottawa |
| Guatemala | is 2 hours behind Ottawa |
| Guayaquil | is 1 hour behind Ottawa |
| Guiyang | is 12 hours ahead of Ottawa |
| Halifax | is 1 hour ahead of Ottawa |
| Hamburg | is 6 hours ahead of Ottawa |
| Hamilton (Bermuda) | is 1 hour ahead of Ottawa |
| Hamilton (Canada) | has no time difference with Ottawa |
| Hangzhou | is 12 hours ahead of Ottawa |
| Hanoi | is 11 hours ahead of Ottawa |
| Harare | is 6 hours ahead of Ottawa |
| Harbin | is 12 hours ahead of Ottawa |
| Harrisburg | has no time difference with Ottawa |
| Hartford | has no time difference with Ottawa |
| Havana | has no time difference with Ottawa |
| Helena | is 2 hours behind Ottawa |
| Helsinki | is 7 hours ahead of Ottawa |
| Hiroshima | is 13 hours ahead of Ottawa |
| Ho Chi Minh | is 11 hours ahead of Ottawa |
| Hobart | is 15 hours ahead of Ottawa |
| Hong Kong | is 12 hours ahead of Ottawa |
| Honiara | is 15 hours ahead of Ottawa |
| Honolulu | is 6 hours behind Ottawa |
| Houston | is 1 hour behind Ottawa |
| Hovd | is 11 hours ahead of Ottawa |
| Hyderabad | is 9 hours, 30 minutes ahead of Ottawa |
| Incheon | is 13 hours ahead of Ottawa |
| Indianapolis | has no time difference with Ottawa |
| Indore | is 9 hours, 30 minutes ahead of Ottawa |
| Iqaluit | has no time difference with Ottawa |
| Islamabad | is 9 hours ahead of Ottawa |
| Istanbul | is 7 hours ahead of Ottawa |
| Izmir | is 7 hours ahead of Ottawa |
| Jackson | is 1 hour behind Ottawa |
| Jacksonville | has no time difference with Ottawa |
| Jaipur | is 9 hours, 30 minutes ahead of Ottawa |
| Jakarta | is 11 hours ahead of Ottawa |
| Jayapura | is 13 hours ahead of Ottawa |
| Jeddah | is 7 hours ahead of Ottawa |
| Jefferson City | is 1 hour behind Ottawa |
| Jersey City | has no time difference with Ottawa |
| Jerusalem | is 7 hours ahead of Ottawa |
| Jilin | is 12 hours ahead of Ottawa |
| Jinan | is 12 hours ahead of Ottawa |
| Jinzhou | is 12 hours ahead of Ottawa |
| Johannesburg | is 6 hours ahead of Ottawa |
| Juba | is 7 hours ahead of Ottawa |
| Juneau | is 4 hours behind Ottawa |
| Kabul | is 8 hours, 30 minutes ahead of Ottawa |
| Kaliningrad | is 6 hours ahead of Ottawa |
| Kampala | is 7 hours ahead of Ottawa |
| Kano Nigeria | is 5 hours ahead of Ottawa |
| Kanpur | is 9 hours, 30 minutes ahead of Ottawa |
| Kansas City | is 1 hour behind Ottawa |
| Kaohsiung | is 12 hours ahead of Ottawa |
| Karachi | is 9 hours ahead of Ottawa |
| Kathmandu | is 9 hours, 45 minutes ahead of Ottawa |
| Kaunas | is 7 hours ahead of Ottawa |
| Kawasaki | is 13 hours ahead of Ottawa |
| Kazan | is 7 hours ahead of Ottawa |
| Khartoum | is 6 hours ahead of Ottawa |
| Khon Kaen | is 11 hours ahead of Ottawa |
| Khulna | is 10 hours ahead of Ottawa |
| Kiev | is 7 hours ahead of Ottawa |
| Kigali | is 6 hours ahead of Ottawa |
| Kingston | is 16 hours ahead of Ottawa |
| Kingston (Jamaica) | is 1 hour behind Ottawa |
| Kingstown | has no time difference with Ottawa |
| Kinshasa | is 5 hours ahead of Ottawa |
| Kiritimati | is 18 hours ahead of Ottawa |
| Kishinev | is 7 hours ahead of Ottawa |
| Kitakyushu | is 13 hours ahead of Ottawa |
| Knoxville | has no time difference with Ottawa |
| Kobe | is 13 hours ahead of Ottawa |
| Kolkata | is 9 hours, 30 minutes ahead of Ottawa |
| Koror | is 13 hours ahead of Ottawa |
| Kowloon | is 12 hours ahead of Ottawa |
| Krakow | is 6 hours ahead of Ottawa |
| Krasnoyarsk | is 11 hours ahead of Ottawa |
| Kuala Lumpur | is 12 hours ahead of Ottawa |
| Kunming | is 12 hours ahead of Ottawa |
| Kupang | is 12 hours ahead of Ottawa |
| Kuwait City | is 7 hours ahead of Ottawa |
| Kyoto | is 13 hours ahead of Ottawa |
| La Coruna | is 6 hours ahead of Ottawa |
| La Paz | has no time difference with Ottawa |
| La Plata | is 1 hour ahead of Ottawa |
| Lagos | is 5 hours ahead of Ottawa |
| Lahore | is 9 hours ahead of Ottawa |
| Lanchow | is 12 hours ahead of Ottawa |
| Las Palmas | is 5 hours ahead of Ottawa |
| Las Vegas | is 3 hours behind Ottawa |
| Lausanne | is 6 hours ahead of Ottawa |
| Laval | has no time difference with Ottawa |
| Leon | is 2 hours behind Ottawa |
| Lexington-Fayette | has no time difference with Ottawa |
| Lhasa | is 12 hours ahead of Ottawa |
| Libreville | is 5 hours ahead of Ottawa |
| Lilongwe | is 6 hours ahead of Ottawa |
| Lima | is 1 hour behind Ottawa |
| Lincoln | is 1 hour behind Ottawa |
| Lisbon | is 5 hours ahead of Ottawa |
| Little Rock | is 1 hour behind Ottawa |
| Liverpool | is 5 hours ahead of Ottawa |
| Ljubljana | is 6 hours ahead of Ottawa |
| Lodz | is 6 hours ahead of Ottawa |
| Lome | is 4 hours ahead of Ottawa |
| London | is 5 hours ahead of Ottawa |
| London (Canada) | has no time difference with Ottawa |
| Long Beach | is 3 hours behind Ottawa |
| Longueuil | has no time difference with Ottawa |
| Lord Howe Island | is 15 hours ahead of Ottawa |
| Los Angeles | is 3 hours behind Ottawa |
| Louisville | has no time difference with Ottawa |
| Luanda | is 5 hours ahead of Ottawa |
| Lubumbashi | is 6 hours ahead of Ottawa |
| Lucknow | is 9 hours, 30 minutes ahead of Ottawa |
| Ludhiana | is 9 hours, 30 minutes ahead of Ottawa |
| Luoyang | is 12 hours ahead of Ottawa |
| Lusaka | is 6 hours ahead of Ottawa |
| Luxembourg | is 6 hours ahead of Ottawa |
| Macau | is 12 hours ahead of Ottawa |
| Madison | is 1 hour behind Ottawa |
| Madrid | is 6 hours ahead of Ottawa |
| Majuro | is 16 hours ahead of Ottawa |
| Malabo | is 5 hours ahead of Ottawa |
| Malang | is 11 hours ahead of Ottawa |
| Male | is 9 hours ahead of Ottawa |
| Mamoutzou | is 7 hours ahead of Ottawa |
| Managua | is 2 hours behind Ottawa |
| Manama | is 7 hours ahead of Ottawa |
| Manaus | has no time difference with Ottawa |
| Manila | is 12 hours ahead of Ottawa |
| Maputo | is 6 hours ahead of Ottawa |
| Mar Del Plata | is 1 hour ahead of Ottawa |
| Markham | has no time difference with Ottawa |
| Maseru | is 6 hours ahead of Ottawa |
| Mataram | is 12 hours ahead of Ottawa |
| Mazatlan | is 3 hours behind Ottawa |
| Mbabane | is 6 hours ahead of Ottawa |
| Mecca | is 7 hours ahead of Ottawa |
| Medan | is 11 hours ahead of Ottawa |
| Medellin | is 1 hour behind Ottawa |
| Melbourne | is 15 hours ahead of Ottawa |
| Melekeok | is 13 hours ahead of Ottawa |
| Memphis | is 1 hour behind Ottawa |
| Mendoza | is 1 hour ahead of Ottawa |
| Merida | is 2 hours behind Ottawa |
| Mesa | is 3 hours behind Ottawa |
| Mexicali | is 3 hours behind Ottawa |
| Mexico City | is 2 hours behind Ottawa |
| Miami | has no time difference with Ottawa |
| Milan | is 6 hours ahead of Ottawa |
| Milwaukee | is 1 hour behind Ottawa |
| Minneapolis | is 1 hour behind Ottawa |
| Minsk | is 7 hours ahead of Ottawa |
| Mississauga | has no time difference with Ottawa |
| Mobile | is 1 hour behind Ottawa |
| Mogadishu | is 7 hours ahead of Ottawa |
| Monaco | is 6 hours ahead of Ottawa |
| Monrovia | is 4 hours ahead of Ottawa |
| Monterrey | is 2 hours behind Ottawa |
| Montevideo | is 1 hour ahead of Ottawa |
| Montgomery | is 1 hour behind Ottawa |
| Montpelier | has no time difference with Ottawa |
| Montreal | has no time difference with Ottawa |
| Moroni | is 7 hours ahead of Ottawa |
| Moscow | is 7 hours ahead of Ottawa |
| Mumbai | is 9 hours, 30 minutes ahead of Ottawa |
| Munich | is 6 hours ahead of Ottawa |
| Murmansk | is 7 hours ahead of Ottawa |
| Muscat | is 8 hours ahead of Ottawa |
| Nagoya | is 13 hours ahead of Ottawa |
| Nagpur | is 9 hours, 30 minutes ahead of Ottawa |
| Nairobi | is 7 hours ahead of Ottawa |
| Nanchang | is 12 hours ahead of Ottawa |
| Naples | is 6 hours ahead of Ottawa |
| Nashville | is 1 hour behind Ottawa |
| Nassau | has no time difference with Ottawa |
| Naypyidaw | is 10 hours, 30 minutes ahead of Ottawa |
| Ndjamena | is 5 hours ahead of Ottawa |
| New Delhi | is 9 hours, 30 minutes ahead of Ottawa |
| New Orleans | is 1 hour behind Ottawa |
| New York | has no time difference with Ottawa |
| Newark | has no time difference with Ottawa |
| Niamey | is 5 hours ahead of Ottawa |
| Nice | is 6 hours ahead of Ottawa |
| Nicosia | is 7 hours ahead of Ottawa |
| Nome | is 4 hours behind Ottawa |
| Norfolk | has no time difference with Ottawa |
| Nouakchott | is 4 hours ahead of Ottawa |
| Noumea | is 15 hours ahead of Ottawa |
| Novgorod | is 7 hours ahead of Ottawa |
| Novosibirsk | is 11 hours ahead of Ottawa |
| Nukualofa | is 17 hours ahead of Ottawa |
| Nuuk | is 2 hours ahead of Ottawa |
| Oakland | is 3 hours behind Ottawa |
| Odesa | is 7 hours ahead of Ottawa |
| Okayama | is 13 hours ahead of Ottawa |
| Oklahoma City | is 1 hour behind Ottawa |
| Omsk | is 10 hours ahead of Ottawa |
| Oranjestad | has no time difference with Ottawa |
| Orlando | has no time difference with Ottawa |
| Osaka | is 13 hours ahead of Ottawa |
| Oslo | is 6 hours ahead of Ottawa |
| Ouagadougou | is 4 hours ahead of Ottawa |
| Pago Pago | is 7 hours behind Ottawa |
| Palembang | is 11 hours ahead of Ottawa |
| Palikir | is 15 hours ahead of Ottawa |
| Palma | is 6 hours ahead of Ottawa |
| Panaji | is 9 hours, 30 minutes ahead of Ottawa |
| Panama | is 1 hour behind Ottawa |
| Papeete | is 6 hours behind Ottawa |
| Paramaribo | is 1 hour ahead of Ottawa |
| Paris | is 6 hours ahead of Ottawa |
| Patna | is 9 hours, 30 minutes ahead of Ottawa |
| Pensacola | is 1 hour behind Ottawa |
| Perm | is 9 hours ahead of Ottawa |
| Perth | is 12 hours ahead of Ottawa |
| Peshawar | is 9 hours ahead of Ottawa |
| Petropavlovsk-Kamchatsky | is 16 hours ahead of Ottawa |
| Philadelphia | has no time difference with Ottawa |
| Phnom Penh | is 11 hours ahead of Ottawa |
| Phoenix | is 3 hours behind Ottawa |
| Pierre | is 1 hour behind Ottawa |
| Pittsburgh | has no time difference with Ottawa |
| Podgorica | is 6 hours ahead of Ottawa |
| Port Elizabeth | is 6 hours ahead of Ottawa |
| Port Louis | is 8 hours ahead of Ottawa |
| Port Moresby | is 14 hours ahead of Ottawa |
| Port Of Spain | has no time difference with Ottawa |
| Port Vila | is 15 hours ahead of Ottawa |
| Port-au-Prince | is 1 hour behind Ottawa |
| Port-aux-Francais | is 9 hours ahead of Ottawa |
| Portland | is 3 hours behind Ottawa |
| Porto | is 5 hours ahead of Ottawa |
| Porto Alegre | is 1 hour ahead of Ottawa |
| Porto Novo | is 5 hours ahead of Ottawa |
| Poznan | is 6 hours ahead of Ottawa |
| Prague | is 6 hours ahead of Ottawa |
| Praia | is 3 hours ahead of Ottawa |
| Pretoria | is 6 hours ahead of Ottawa |
| Pristina | is 6 hours ahead of Ottawa |
| Providence | has no time difference with Ottawa |
| Pune | is 9 hours, 30 minutes ahead of Ottawa |
| Pyongyang | is 13 hours ahead of Ottawa |
| Qiqihar | is 12 hours ahead of Ottawa |
| Quebec | has no time difference with Ottawa |
| Quito | is 1 hour behind Ottawa |
| Rabat | is 4 hours ahead of Ottawa |
| Raleigh | has no time difference with Ottawa |
| Rarotonga | is 6 hours behind Ottawa |
| Rawaki | is 17 hours ahead of Ottawa |
| Recife | is 1 hour ahead of Ottawa |
| Regina | is 2 hours behind Ottawa |
| Reykjavik | is 4 hours ahead of Ottawa |
| Richmond | has no time difference with Ottawa |
| Riga | is 7 hours ahead of Ottawa |
| Rio Branco | is 1 hour behind Ottawa |
| Rio De Janeiro | is 1 hour ahead of Ottawa |
| Riverside | is 3 hours behind Ottawa |
| Riyadh | is 7 hours ahead of Ottawa |
| Road Town | has no time difference with Ottawa |
| Rochester | has no time difference with Ottawa |
| Rome | is 6 hours ahead of Ottawa |
| Rosario | is 1 hour ahead of Ottawa |
| Roseau | has no time difference with Ottawa |
| Rotterdam | is 6 hours ahead of Ottawa |
| Sacramento | is 3 hours behind Ottawa |
| Saint Georges | has no time difference with Ottawa |
| Saint John | is 1 hour ahead of Ottawa |
| Saint Johns | has no time difference with Ottawa |
| Saint Paul | is 1 hour behind Ottawa |
| Saint-Denis | is 8 hours ahead of Ottawa |
| Saint-Petersburg | is 7 hours ahead of Ottawa |
| Saint-Pierre | is 2 hours ahead of Ottawa |
| Saipan | is 14 hours ahead of Ottawa |
| Salem | is 3 hours behind Ottawa |
| Salt Lake City | is 2 hours behind Ottawa |
| Salta | is 1 hour ahead of Ottawa |
| Salvador | is 1 hour ahead of Ottawa |
| Salzburg | is 6 hours ahead of Ottawa |
| Samara | is 8 hours ahead of Ottawa |
| San Antonio | is 1 hour behind Ottawa |
| San Bernardino | is 3 hours behind Ottawa |
| San Diego | is 3 hours behind Ottawa |
| San Francisco | is 3 hours behind Ottawa |
| San Jose | is 3 hours behind Ottawa |
| San Jose (Costa Rica) | is 2 hours behind Ottawa |
| San Juan | has no time difference with Ottawa |
| San Luis Potosi | is 2 hours behind Ottawa |
| San Marino | is 6 hours ahead of Ottawa |
| San Salvador | is 2 hours behind Ottawa |
| Sana | is 7 hours ahead of Ottawa |
| Santa Ana | is 2 hours behind Ottawa |
| Santa Fe | is 2 hours behind Ottawa |
| Santiago | is 1 hour ahead of Ottawa |
| Santo Domingo | has no time difference with Ottawa |
| Sao Paulo | is 1 hour ahead of Ottawa |
| Sao Tome | is 4 hours ahead of Ottawa |
| Sapporo | is 13 hours ahead of Ottawa |
| Sarajevo | is 6 hours ahead of Ottawa |
| Saskatoon | is 2 hours behind Ottawa |
| Seattle | is 3 hours behind Ottawa |
| Semarang | is 11 hours ahead of Ottawa |
| Sendai | is 13 hours ahead of Ottawa |
| Seoul | is 13 hours ahead of Ottawa |
| Shanghai | is 12 hours ahead of Ottawa |
| Shenzhen | is 12 hours ahead of Ottawa |
| Shijiazhuang | is 12 hours ahead of Ottawa |
| Sialkot | is 9 hours ahead of Ottawa |
| Sian | is 12 hours ahead of Ottawa |
| Singapore | is 12 hours ahead of Ottawa |
| Singaraja | is 12 hours ahead of Ottawa |
| Sioux Falls | is 1 hour behind Ottawa |
| Skopje | is 6 hours ahead of Ottawa |
| Sochi | is 7 hours ahead of Ottawa |
| Sofia | is 7 hours ahead of Ottawa |
| Southampton | is 5 hours ahead of Ottawa |
| St. Johns | is 1 hour, 30 minutes ahead of Ottawa |
| St. Louis | is 1 hour behind Ottawa |
| St. Petersburg | has no time difference with Ottawa |
| Stanley | is 1 hour ahead of Ottawa |
| Stockholm | is 6 hours ahead of Ottawa |
| Stockton | is 3 hours behind Ottawa |
| Stuttgart | is 6 hours ahead of Ottawa |
| Surabaya | is 11 hours ahead of Ottawa |
| Surakarta | is 11 hours ahead of Ottawa |
| Surat | is 9 hours, 30 minutes ahead of Ottawa |
| Surrey | is 3 hours behind Ottawa |
| Suva | is 16 hours ahead of Ottawa |
| Sydney | is 15 hours ahead of Ottawa |
| Szczecin | is 6 hours ahead of Ottawa |
| Taegu | is 13 hours ahead of Ottawa |
| Taiohae | is 5 hours, 30 minutes behind Ottawa |
| Taipei | is 12 hours ahead of Ottawa |
| Taiyuan | is 12 hours ahead of Ottawa |
| Tallinn | is 7 hours ahead of Ottawa |
| Tampa | has no time difference with Ottawa |
| Tangier | is 4 hours ahead of Ottawa |
| Tangshan | is 12 hours ahead of Ottawa |
| Tarawa | is 16 hours ahead of Ottawa |
| Tashkent | is 9 hours ahead of Ottawa |
| Tbilisi | is 8 hours ahead of Ottawa |
| Tegucigalpa | is 2 hours behind Ottawa |
| Tehran | is 8 hours, 30 minutes ahead of Ottawa |
| Tel Aviv | is 7 hours ahead of Ottawa |
| The Settlement | is 11 hours ahead of Ottawa |
| The Valley | has no time difference with Ottawa |
| Thimphu | is 10 hours ahead of Ottawa |
| Tianjin | is 12 hours ahead of Ottawa |
| Tijuana | is 3 hours behind Ottawa |
| Tirane | is 6 hours ahead of Ottawa |
| Tokyo | is 13 hours ahead of Ottawa |
| Toledo | has no time difference with Ottawa |
| Topeka | is 1 hour behind Ottawa |
| Toronto | has no time difference with Ottawa |
| Torshavn | is 5 hours ahead of Ottawa |
| Trenton | has no time difference with Ottawa |
| Tripoli | is 6 hours ahead of Ottawa |
| Tsingtao | is 12 hours ahead of Ottawa |
| Tucson | is 3 hours behind Ottawa |
| Tucuman | is 1 hour ahead of Ottawa |
| Tunis | is 5 hours ahead of Ottawa |
| Turin | is 6 hours ahead of Ottawa |
| Ufa | is 9 hours ahead of Ottawa |
| Ulaanbaatar | is 12 hours ahead of Ottawa |
| Unalaska | is 4 hours behind Ottawa |
| Vadodara | is 9 hours, 30 minutes ahead of Ottawa |
| Vaduz | is 6 hours ahead of Ottawa |
| Valletta | is 6 hours ahead of Ottawa |
| Vancouver | is 3 hours behind Ottawa |
| Varanasi | is 9 hours, 30 minutes ahead of Ottawa |
| Vatican City | is 6 hours ahead of Ottawa |
| Venice | is 6 hours ahead of Ottawa |
| Veracruz | is 2 hours behind Ottawa |
| Victoria | is 3 hours behind Ottawa |
| Victoria (Seychelles) | is 8 hours ahead of Ottawa |
| Vienna | is 6 hours ahead of Ottawa |
| Vientiane | is 11 hours ahead of Ottawa |
| Vilnius | is 7 hours ahead of Ottawa |
| Virginia Beach | has no time difference with Ottawa |
| Visakhapatnam | is 9 hours, 30 minutes ahead of Ottawa |
| Vladivostok | is 14 hours ahead of Ottawa |
| Warsaw | is 6 hours ahead of Ottawa |
| Washington DC | has no time difference with Ottawa |
| Wellington | is 17 hours ahead of Ottawa |
| Whitehorse | is 3 hours behind Ottawa |
| Wichita | is 1 hour behind Ottawa |
| Willemstad | has no time difference with Ottawa |
| Windhoek | is 6 hours ahead of Ottawa |
| Windsor | has no time difference with Ottawa |
| Winnipeg | is 1 hour behind Ottawa |
| Wroclaw | is 6 hours ahead of Ottawa |
| Wuhan | is 12 hours ahead of Ottawa |
| Yamoussoukro | is 4 hours ahead of Ottawa |
| Yangon | is 10 hours, 30 minutes ahead of Ottawa |
| Yaounde | is 5 hours ahead of Ottawa |
| Yaren | is 16 hours ahead of Ottawa |
| Yazd | is 8 hours, 30 minutes ahead of Ottawa |
| Yekaterinburg | is 9 hours ahead of Ottawa |
| Yellowknife | is 2 hours behind Ottawa |
| Yerevan | is 8 hours ahead of Ottawa |
| Yokohama | is 13 hours ahead of Ottawa |
| Yuzhno-Sakhalinsk | is 15 hours ahead of Ottawa |
| Zagreb | is 6 hours ahead of Ottawa |
| Zhengzhou | is 12 hours ahead of Ottawa |
| Zibo | is 12 hours ahead of Ottawa |
| Zurich | is 6 hours ahead of Ottawa |
| Central Time | is 1 hour behind Ottawa |
| Eastern Time | No time difference with Ottawa |
| Mountain Time | is 2 hours behind Ottawa |
| Pacific Time | is 3 hours behind Ottawa |
| AEST - Australian Eastern Standard Time | is 14 hours ahead of Ottawa |
| CET - Central European Time | is 5 hours ahead of Ottawa |
| GMT - Greenwich Mean Time | is 4 hours ahead of Ottawa |
| HST - Hawaii-Aleutian Standard Time | is 6 hours behind Ottawa |
| IST - India Standard Time | is 9 hours, 30 minutes ahead of Ottawa |