Companies catalogue
- O'Connells Hotel, South Melbourne
- O'Donohue Picnic Ground, Sherbrooke
- OKAMI Japanese Restaurant - Caulfield, Caulfield North
- OZSKI YUNGABURRA FNQ., Yungaburra
- Oak Park Reserve, Oak Park
- Oak Park Stadium, Oak Park
- Oakleigh Public Golf Course, Oakleigh
- Oaks and Ashes Picnic Areas - Jells Park, Wheelers Hill
- Obento Japanese Cuisine, Melbourne
- Ocean Garden Chinese & Malaysian Food Take Away, Montmorency
- Ocean King Chinese Restaurant, Glen Waverley
- Ocha Japanese Restaurant, Hawthorn
- Ochre Australia Pty Ltd, South Yarra
- Officer Public Hall, Officer
- Offices Association, Eltham
- Ogawa Japanese Cafe, Diamond Creek
- Ohboi Creative, Ainslie
- Okey Dokey Cairns Tours PTY LTD, Mooroobool
- Old Colonists' Association of Victoria, Berwick
- Old Hadies Bakery, Dandenong
- Old Ivanhoe Grammarians’ Association, Ivanhoe
- Old Melburnians Athletics Club, South Yarra
- Old Scotch Collegians' Association, Hawthorn
- Old Strathmore Bakery, Essendon
- Old Xaverians Football Club, Kew
- Olinda Creek Hotel, Lilydale
- Olinda Falls Picnic Ground, Mount Dandenong
- Olinda Football-Netball Club, Olinda
- On Point Tiling Australia, Cairns
- OnTheGo Advertising, Canberra
- OnTopBar, Ormond
- One Burrito, Armadale
- One Step Ahead Dance Studio, Narre Warren
- One Tree Hill Picnic Ground, Tremont
- One Way Lebanese Bakery, Lalor
- Onemda, Doncaster East
- Online Car Brokers, South Melbourne
- Online Communications, Yungaburra
- Only Floors, Edge Hill
- Open Cellar Wine Store & Bar, Kew
- Optimal Hearing, Malvern East
- Optimal Venue Solutions, Port Melbourne
- Oregano House Lebanese bakery & cafe, Craigieburn
- Oriental Charcoal BBQ, Footscray
- Oriental Garden Chinese Restaurant, Croydon
- Oriental Garden Chinese Restaurant, Croydon
- Oriental Jade Restaurant, Greensborough
- Original St. Martins Anglican Church - Southern Sherbrooke Historical Society, Belgrave Heights
- Origo BPO, Abbotsford
- Ormond Hall, Prahran
- Ormond Uniting Church, Ormond
- Oscar's Alehouse, Belgrave
- Ostomy Association Of Melbourne Inc, Burwood
- Our Natural Advantage, Canberra
- Oval 12, Warwick Armstrong Oval, Saint Kilda
- Oval 13, Henry Scott Oval, Albert Park
- Oval 17, Bob Skilton Oval, Albert Park
- Oval 21, John Blackham Oval, Albert Park
- Oven Fresh Bread, Mulgrave
- Overflow Cafe | Wine Bar, Mount Waverley
- Overport Park Tennis Club, Frankston South
- Oz Web Shop, Cairns City