- O'Halloran Crescent
- O'Henry Grove
- Oak Knolls Crescent
- Oakhaven Drive
- Oakley Boulevard
- Oakmeadow Boulevard
- Oakridge Drive
- Oakworth Crescent
- Oasis Boulevard
- Oates Drive
- Obris Crescent
- Ockwell Manor Drive
- Old Finch Avenue
- Old Kingston Road
- Olga Street
- Omni Drive
- Orangewood Crescent
- Orator Gate
- Orchard Park Drive
- Ordway Road
- Orlando Boulevard
- Orleans Drive
- Ormerod Street
- Orton Park Road
- Orville Road
- Osprey Court
- Osterhout Place
- Ovendon Square
- Overlord Crescent
- Overture Road
- Oxhorn Road