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