- O'Malley Drive
- O'Mara Drive
- Oakdale Avenue
- Oakmeadow Place
- Oakmount Drive
- Oakridge Avenue
- Oakwood Avenue
- Oarsman Crescent
- Oblate Street
- October Drive
- Oille Street
- Old Coach Road
- Old Lakeshore Boulevard
- Old Martindale Road
- Old Mill Road
- Old Orchard Road
- Old Oxford Road
- Old Pine Trail
- Olde School Crescent
- Oliver Lane
- Ontario Lane
- Ontario Street
- Orchard Avenue
- Oriole Drive
- Orlando Drive
- Ormonde Avenue
- Oscar Avenue
- Oswald Avenue
- Oswego Avenue
- Ottawa Street
- Overholt Street
- Oxford Street