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- Oak Bay Recreation Centre
- Oakes Garden Theatre
- Oak Heights Estate Winery
- Oaklawn Farm Zoo
- Oakridge Arena
- Oakridge Community Association
- Oakridge Community Association Rink
- Oakville Arena
- Oakville Art Society
- Oakville Centre for the Performing Arts
- Oakville Gallery At Centennial Square
- Oakville Gallery In Gairloch Gardens
- Oakville Harbour
- Oakville Museum
- Oakwood Community Centre
- Observatoire de la Capitale
- Observatoire du Mont Cosmos
- Ocad Gallery
- Ocala Winery
- Ocean Science Center
- Oceanside Place
- O'Connor Park Rink
- O'Dell Inn Museum
- Odyssee Nunavut
- Oeil de Poisson
- Off Braodway Arts Centre
- Ogema Recreation Complex
- O'Hara Mill Homestead & Conservation Area
- Oh Canada Eh?! Dinner Show
- O'Hehir Arena
- Oilfields Regional Arena
- Oil Museum of Canada
- Oilsands Discovery Centre
- Okanagan Heritage Museum
- Okanagan Military Museum
- Okanagan Science Centre
- Okanagan Training Rink
- Okotoks Recreation Centre
- Old Burying Ground
- Old City Hall
- Old City Hall
- Old Codroy Carding Mill
- Old Government House
- Old Hay Bay Church National Historic Site
- Old Kildonan Presbyterian Church
- Old Log Church Museum
- Old Port
- Old School House Art Centre
- Olds & District Sports Complex
- Old St James Anglican Church
- Old Stone Jail
- Old Stone Mill
- Old Strathcona (Whyte Avenue)
- Oldtimers Museum
- Old Town Lunenburg
- O'Leary Community Sports Centre
- Oliver Arena
- Oliver Arena
- Oliver & District Museum
- Oliver Lake Wilderness Lodge
- Oliver Road Rink
- Oliver Twist Estate Winery
- Olivier Soapery
- Olympia de Longueuil
- Olympia de Ville-Marie
- Olympia Yvan Cournoyer
- Olympic Hall of Fame
- Olympic Ice Surface Arena
- Olympic Plaza
- Olympic Plaza Rink
- One Financial Place Courtyard
- Ongaro Outdoors
- Onion Lake Arena
- Onoway Arena
- Ontario College of Art and Design
- Ontario Maze
- Ontario Parliament Building
- Ontario Place
- Ontario Regimental Museum
- Ontario Science Centre
- Ontario Workers Arts and Heritage Centre
- Ops Community Centre
- Optimist Arena
- Optimist Arena
- Optimist Park Rink
- Optometry Museum of Vision Science
- Orange bleue
- Orangeman's Lodge
- Orange Museum
- Oratoire Notre-Dame-Du-Mont-Saint-Jospeh
- Orchard Park Rink
- Orchard Park Shopping Centre
- O'Reilly House Museum
- Orillia Boat Cruises
- Orillia Community Centre Arena
- Orillia Museum of Art & History
- Oriole Arena
- Oriole Park School Rink
- Orofino Vineyards
- Orono Arena & Community Centre
- Oro Township Community Arena
- Orwell Corner Historic Village
- Osgoode Community Centre
- Osgoode Hall
- Osgoode Township Historical Society & Museum
- Oshan Whale Cruises
- Oshawa Community Museum & Archives
- Oshawa Gardens (General Motors Centre)
- Oshawa Military & Industrial Museum
- Oshawa Valley Botanical Gardens
- Oshawa Zoo and Fun Farm
- Osoyoos Art Gallery
- Osoyoos Desert Centre
- Osoyoos Desert Model Railroad
- Osprey Community Arena
- Otonabee Memorial Community Centre
- Ottawa Art Gallery
- Ottawa City Hall
- Ottawa Civic Centre
- Ottawa Farmers' Market
- Otter Creek Rink
- Otter Lake Recreation Centre
- Our Lady of Lourdes Grotto
- Our Lady of Mercy Museum
- Our Lady of Sorrows Chapel
- Our Ponderosa Ipperwash Beach
- Outdoor Art Gallery
- Over The Top Museum
- Owen Sound Coliseum
- Owen Sound Marine & Rail Museum
- Oxbow Arena
- Oxford Arena
- Oxford County Museum School
- Oxtongue Craft Cabin & Gallery
- Oyen Memorial Arena
