- O'Brien Crescent
- O'Meara Street
- Oak Forest Crescent
- Oak Lawn Road
- Oak Park Walk
- Oak Point Highway
- Oak Street
- Oakburn Place
- Oakcrest Place
- Oakdale Drive
- Oakdean Boulevard
- Oakdean Crescent
- Oakenwald Avenue
- Oakfield Place
- Oakglen Place
- Oakgrove Bay
- Oakhill Point
- Oakhurst Crescent
- Oakland Avenue
- Oakleaf Drive
- Oakleigh Place
- Oakmont Avenue
- Oakridge Bay
- Oakstone Place
- Oakview Avenue
- Oakwood Avenue
- Oberlin Road
- Ocean Ridge Drive
- Oddy Street
- Odessa Cove
- Olafson Avenue
- Old Commonwealth Path
- Old Mill Road
- Olford Crescent
- Olinyk Cove
- Olive Street
- Olivewood Crescent
- Olson Way
- Omands Creek Boulevard
- Oneida Place
- Opal Place
- Optimist Way
- Orange Street
- Orchard Hill Drive
- Orchard Lane
- Orchard Park Boulevard
- Orford Crescent
- Oriole Street
- Ormiston Road
- Orum Drive
- Osborne Street
- Osborne Street North
- Osgoode Place
- Osprey Place
- Ossington Court
- Ostafiew Farm Road
- Oswald Bay
- Ottawa Avenue
- Otter Lake Place
- Otter Street
- Oustic Avenue East
- Oustic Avenue West
- Outhwaite Street
- Overdale Street
- Overton Street
- Overwater Cove
- Owen Street
- Owena Street
- Oxbow Bend Road
- Oxford Street