- Oak Street
- Oakfield Court
- Oakland Crescent
- Oakpark Drive
- Oakridge Avenue
- Oakridge Street
- Odessa Drive
- Ojibway Parkway
- Olcott Avenue
- Old Front Road
- Old Tecumseh Road
- Old West Avenue
- Olive Road
- Omira Street
- Oneida Court
- Ongaro Court
- Ontario Street
- Ora Street
- Orchard Drive
- Orchard Grove
- Orchard Park Drive
- Orford Street
- Oriole Boulevard
- Orion Crescent
- Osaka Circle
- Osborn Crescent
- Ottawa Street
- Ouellette Avenue
- Ouellette Place
- Outer Drive
- Outram Avenue
- Oxley Avenue