- O'Brien Court
- O'Brien Crescent
- O'Brien Place
- O'Brien Terrace
- O'Neil Crescent
- O'Regan Court
- O'Regan Crescent
- Oliver Crescent
- Olmstead Road
- Olson Lane West
- Ontario Avenue
- Ortona Street
- Osborne Street
- Osler Street
- Ottawa Avenue North
- Ottawa Avenue South
- Overholt Bay
- Overholt Court
- Overholt Crescent
- Overholt Place
- Overholt Terrace
- Owen Manor
- Oxford Street