NSW localities beginning with O
- O'Connell
- Oak Flats
- Oakdale
- Oakey Park
- Oakhampton
- Oakhampton Heights
- Oakhurst
- Oaklands
- Oakville
- Oakwood
- Oallen
- Oatlands
- Oatley
- Oban
- Obanvale
- Oberne Creek
- Oberon
- Obley
- Ocean Shores
- Ogunbil
- Old Adaminaby
- Old Bar
- Old Bonalbo
- Old Erowal Bay
- Old Grevillia
- Old Guildford
- Old Junee
- Old Mill
- Old Station
- Old Toongabbie
- Olinda
- Olney
- Omadale
- One Mile
- One Tree
- Oolong
- Ooma
- Ootha
- Ophir
- Oran Park
- Orange
- Orange Grove
- Orangeville
- Orchard Hills
- Orient Point
- Orton Park
- Osborne
- Osterley
- Oswald
- Otford
- Oura
- Ourimbah
- Ournie
- Owens Gap
- Oxford Falls
- Oxley (Balranald)
- Oxley (Warren)
- Oxley Island
- Oxley Park
- Oxley Vale
- Oyster Bay
- Oyster Cove