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- Oakbank Park
- Oak Bay Provincial Park
- Oakcrest Parkette
- Oakdale Park
- Oakes Park
- Oakfield Provincial Park
- Oakfield Woods Park
- Oak Hammock Marsh Interpretive Centre
- Oak Haven Park
- Oak Hill Lake Park
- Oakhill Park
- Oak Lake Provincial Park
- Oakland Road Park
- Oaklands Park
- Oak Meadows Park
- Oak Park
- Oak Park
- Oak Point Provincial Park
- Oakridge Park
- Oakridge Park
- Oak Street Park
- Oakview Park
- Oakview Park
- Oakwood Court Park
- Oakwood Park
- Oastler Lake Provincial Park
- Oates Park
- Oatway Park
- Obabika River Provincial Park
- Obatanga Provincial Park
- Obed Lake Provincial Park
- O'Brien Provincial Park
- Oceanic Drive Park
- Ocean View Park
- O'connor Park
- Octopus Islands Marine Provincial Park
- Odell Park
- Odessa Park
- Odette Sculpture Park
- Officers' Square
- Ogema Regional Park
- Ogilvie North Park
- Ogilvie Park
- Ogilvie South Park
- Ojibway Provincial Park
- Okanagan Falls Provincial Park
- Okanagan Lake Provincial Park
- Okanagan Mountain Provincial Park
- Okanagan Park
- Okanangan Lake Park
- O'Keefe Lake Provincial Park
- Okeover Arm Provincial Park
- Old Burnhamthorpe Road Parkette
- Old Coach Road Trail Park
- Old Colony Park
- Oldewood Park
- Oldham Road Park
- Old Man Lake Provincial Park
- Old March Town Hall Park
- Old Mill Park
- Old Mill Park
- Old Oak Park
- Old Orchard Park
- Old Orchard Park
- Old Riverside Park
- Old Sheppard Park
- Oleary Drive Park
- Olexin Park
- Oliver Cove Marine Provincial Park
- Oliver Park
- Olmstead Park
- Olympia Village Trailer Park
- Olympic Park
- Olympic Plaza
- Omagh Park
- Omand Park
- Omega Court Park
- Omineca Provincial Park and Protected Area
- Onaping Tot Lot
- Oneida Park
- One Island Lake Provincial Park
- Ontario Street Parkette
- Opasquia Provincial Park
- Open Hearth Park
- Opeongo River Provincial Park
- Oppenheimer Park
- Optimist Club Park
- Optimiste Park
- Optimist Harbourview Park
- Optimist Park
- Optimist Park
- Optimist Park
- Optimist Park
- Optimist Park
- Optimist Park
- Optimist Park
- Optimist Youth Park
- Orchard Community Park
- Orchard Hollow Park
- Orchard Park
- Orchard Park
- Orchard Park
- Oregon Jack Provincial Park
- Oren Willson Park
- Oriole Park
- Oriole Park
- Orkney Drive Park
- Orlando Park
- Ormskirk Park
- Orono Park
- Orval Allen Park
- Osborne Bay Regional Park
- Osborne Park
- Oscar Paulson Park
- Osgoode Community Centre
- Osgoode Village Park
- Osprey Park
- Osprey Ridge East
- Oswald Park
- Otoskwin-Attawapiskat River Provincial Park
- Ottawa Business Park
- Ottawa River Provincial Park
- Otter Creek Park
- Otter Lake Provincial Park
- Otter Park
- Otterson Park
- Otto Leslie Park
- Ouellette Park
- Ouimet Canyon Provincial Park
- Ourland Park
- Outlook & District Regional Park
- Ovayok (Mount Pelly) Territorial Park
- Oven Head Provincial Park
- Overbrook Park
- Overflowing River Provincial Park
- Overlanders Park
- Overlea Park
- Owen Heights Park
- Owen Mann Park
- Owl Park
- Owlshead Park
- Owl Valley Park / Shoreline Park
- Owyacumish River Provincial Park
- Oxford Park
- Oxford Park
- Oxford School Park
- Oxford Station Park
- Oxtongue River-Ragged Falls Provincial Park
- Ozerna Park
