This is a list of islands of Ontario.
Lake Abitibi
- Black Island
- Kenosha Island
- Mistaken Islands
Balsam Lake
- Grand Island
Big Gull Lake - West End - Little Gull Lake
- Belle Island
- Carlson Island
- Snake Island
- Chimney Island
- Goat Island
- Race Island[1]
- Rifle Island
Big Gull Lake - East End
- Beacon Island
- Bear Boundary Island
- Big Boundary Island
- Boundary Island
- Brothers Island
- Green Island
- Johns Island
- Long Island
- Marshall Island
- Pogue's Island
- Redlac Island
- Sister Island
- Three Sister's Island
- Viking Point Island
- Whalen Island
- Whispering Pines Island
Big Rideau Lake
- Big Island
- Exe Island
- Grindstone Island
- Land's End Island
- Long Island
- Oak Island
- Tar Island
- Turnip Island
- Tower Island
Buckhorn Lake
- Emerald Isle
- Fox Island
- Nichol Island
Cataraqui River
- Isle of Man
Charleston Lake
- Crosier Island
Lake Chemong
- Big Island
Lake Couchiching
- Chiefs Island
Cranberry Lake
- Beaupre Island
Detroit River
- Bois Blanc Island
- Fighting Island
- Peche Island
- Turkey Island
Lake Erie
Fairbank Lake
- Fairbank Island
French River
Gloucester Pool
- Broadview Island
- Deer Island
- Lauley Island
Grand River
- Kerby Island
Gull Lake
- Long Island
Lake Huron
Georgian Bay
North Channel
Parry Sound
- Elizabeth Island
- Huckleberry Island
- Mowat Island
- Oak Island
Hay Bay
- Clark Island
Lake Joseph
- Cameron Island
- Chief's Island
- Yoho Island
- Gitchie Island
Lake Kagawong
- Bass Island
- Gull Island
- Kakawaie Island
- Little Island
Kawagama Lake
- Dennison Island
- Big Trout Island
- Bear Island
- Echo Island
- Little Trout Island
- Trout Island
Larder Lake
- Big Pete Island
- Island U
Lower Buckhorn Lake
- Wolf Island
McArthur Lake
- McArthur Island
- Sharprock Island
- Blueberry Island
- Hidden Island
- Delta Island
- Shadfly Island
- Olyjian Isle
- Diorite Island
- Midway Island
- Crayfish Island
- Cat Island
- Maziic Island
- Taylor's Island
Lake Mindemoya
- Treasure Island
Mississippi River
- Greig Island
Moose River
- Moose Factory Island
Lake Muskoka
Severn Sound
Niagara River
- Cedar Island
- Gull Island
- Navy Island
Lake Nipigon
- Geike Island
- Kelvin Island
- Logan Island
- Murchison Island
- Shakespeare Island
Lake Nipissing
Lake Ontario
Bay of Quinte
- Bassett Island
- Big Island
- Lyons Island
- Salmon Island
See also
Ottawa River
Pigeon Lake
- Big Island
Rice Lake
- Cow Island
- Harris Island
- Long Island
- Sugar Island
- White Island
Rideau River
- Camper's Island (Ottawa)
- Clifford Allen Island (Ottawa)
- Cummings Island (Ottawa)
- Green Island (Ottawa)
- Long Island (Manotick)
- Maple Island (Ottawa)
- Nicolls Island (Manotick)
- Porter Island (Ottawa)
Lake Rosseau
- Florence Island
- Tobin Island
- Wellesley Island
Lake Scugog
- Washburn Island
Lake Simcoe
- Fox Island
- Georgina Island
- Grape Island
- Snake Island
- Strawberry Island
- Thorah Island
Skootamatta Lake
- Big Island
Lake Saint Clair (North America)
- Bassett Island
- Grassy Bend Islands
- St. Anne Island
- Squirrel Island
- Walpole Island
St. Clair River
- Fawn Island
- Stag Island
- Walpole Island
Saint Lawrence River
- Burnt Island
- Pine Island
Lake of the Woods
- Aulneau Island
- Big Island
- Bigsby Island
- Copper Island
- Corkscrew Island
- Hay Island
- LaVérandrye Island
- Scotty Island
- Sultana Island
- Thompson Island
- Wolf Island
- Copeland Island
- Town Island
- Coney Island
- Treaty Island
- Shammis Island
- Crow Rock Island
- Mather Island
- Allie Island
- East Allie Island
- Big Narrows Island
- de Noyon Island
- Bishops Point Island
- Long Point Island