- Oakhurst to Mercure Sydney
- Oakville to Mercure Sydney
- Oatlands to Mercure Sydney
- Oatley to Mercure Sydney
- Old Guildford to Mercure Sydney
- Old Toongabbie to Mercure Sydney
- Oran Park to Mercure Sydney
- Orchard Hills to Mercure Sydney
- Oxford Falls to Mercure Sydney
- Oxley Park to Mercure Sydney
- Oyster Bay to Mercure Sydney
- Sydney Airport to Mercure Sydney
- Mercure Sydney to Oakhurst
- Mercure Sydney to Oakville
- Mercure Sydney to Oatlands
- Mercure Sydney to Oatley
- Mercure Sydney to Old Guildford
- Mercure Sydney to Old Toongabbie
- Mercure Sydney to Oran Park
- Mercure Sydney to Orchard Hills
- Mercure Sydney to Oxford Falls
- Mercure Sydney to Oxley Park
- Mercure Sydney to Oyster Bay
- Mercure Sydney to Sydney Airport