Ontario
- Entire province:
- Omsk, Russia
- Aurora:
- Leksand, Sweden
- Bala:
- Bala, Wales, UK
- Barrie:
- Murayama, Japan
- Taizhou, China
- Zweibrücken, Germany (1997, twinning)
- Belleville:
- Lahr, Germany
- Brampton:
- Benxi, China
- Fengcheng, China
- Marikina City, Philippines
- Plano, Texas, USA
- Brantford:
- Ostrów Wielkopolski, Poland
- Brockville:
- Ontario, California, USA
- Burlington:
- Itabashi, Japan (1997)
- Myrtle Beach, South Carolina, USA
- Cambridge:
- Saginaw, Michigan, USA
- Carleton Place:
- Comrie, Scotland, UK
- Franklin, Tennessee, USA
- Chatham-Kent:
- Harper's Ferry, West Virginia, USA (2005)
- Gangbuk-gu, South Korea (2004)
- Cobourg:
- Coburg, Germany
- Collingwood:
- Boone, North Carolina, United States
- Zihuatanejo, Guerrero, Mexico
- Katano, Japan
- Cornwall:
- Coventry, England, UK (1972)
- Dundas:
- Kaga, Japan (1967)
- East York:
- Skopje, Macedonia
- Fergus:
- Blairgowrie, Scotland, UK
- Georgina:
- Redford, Michigan, USA
- Goderich:
- Bay City, Michigan, USA
- Greater Sudbury:
- Homyel, Belarus
- Kokkola/Karleby, Finland
- Guelph:
- Treviso, Veneto, Italy
- Castelfranco Veneto, Italy
- Hamilton:
- Flint, Michigan, USA (1987)
- Fukuyama, Japan (1976)
- Kingston:
- Cienfuegos, Cuba (2005)
- Scottsdale, Arizona, USA
- Kingsville:
- Westlake, Ohio, United States
- Lindsay:
- Nayoro, Japan (1967)
- London:
- Nanjing, Jiangsu Province, China
- Markham:
- Cary, North Carolina, USA
- Farmers Branch, Texas, USA
- Nördlingen, Bavaria, Germany
- Wuhan, Hubei, China (2006)
- Mississauga:
- Kariya, Japan (1981)
- North Bay:
- Moncton, New Brunswick, Canada
- Oakville:
- Neyagawa, Japan
- Ottawa:
- Beijing, China (1999)
- Buenos Aires, Argentina
- Catania, Sicily, Italy
- Palermo, Sicily, Italy
- Campobasso, Molise, Italy
- Seoul, South Korea
- Owen Sound:
- Miamisburg, Ohio, United States
- Perth:
- Perth, Scotland, UK
- Peterborough:
- Ann Arbor, Michigan, USA
- Richmond Hill:
- Lakeland, Florida, USA
- Sault Ste. Marie:
- County Louth, Ireland
- Forssa, Finland
- Maia, Portugal
- Sault Ste. Marie, Michigan, USA (also twin city)
- St. Catharines:
- Port of Spain, Trinidad
- Stratford:
- Stratford, Connecticut, USA
- Sudbury — See Greater Sudbury
- Thunder Bay:
- Duluth, Minnesota, USA
- Gifu, Japan
- Keelung, Taiwan
- Little Canada, Minnesota, USA
- Seinäjoki, Finland
- Timmins:
- Naoshima, Kagawa, Japan
- Toronto — See Sister cities of Toronto
- Vaughan:
- Ramla, Israel
- Sora, Lazio, Italy
- Warkworth:
- Warkworth, New Zealand (since 2003)
- Waterloo:
- Centerville, Ohio, USA
- Whitby:
- Longueuil, Quebec
- Feldkirch, Austria
- Windsor:
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- Woodstock:
- Sylvania, Ohio, USA
- York Region
- Omsk, Russia
Read more about this topic: List Of Sister Cities In Canada