Companies catalogue
- O'Brien and Sons Excavation, Blackburn
- O'Briens Plastics, Campbellfield
- O'Brien® Glass Bendigo, Golden Square
- O.D.T. Engineering, Dandenong South
- O.S. Financial Planning, Wodonga
- OC COMMUNICATIONS & EVENTS, East Melbourne
- OMICRON electronics Australia Pty Ltd, Bundoora
- ORS Group, Mornington
- ORS Group, Frankston
- ORS Group, Hastings
- ORS Group, Epping
- OUD Engineering, Reservoir
- OUTBACK SAM, Bayswater
- OZ Gadgets - Gadgets and Gizmos Store, Bayswater
- OZ LED GROWLIGHTS, Black Rock
- OZ Solar Energy solutions Pty Ltd, Brighton
- OZWIDE Recruitment Services, Coolaroo
- OZeWebHelp Pty. Ltd., Malmsbury
- Oakleigh Engineering, Dandenong South
- Oasis Exports, Southbank
- Oasis Turf & Oasis Pest Control Supplies, Carrum Downs
- Obsolete Auto Parts Pty Ltd, Bilpin
- Ocean Australasia PTY Ltd., Toorak
- Ocean Controls, Seaford
- Octanorm Australia, Carrum Downs
- Odin Corporation Pty Ltd, Melbourne
- Off Ya Tree, Bendigo
- Officeworks South Melbourne, South Melbourne
- Offshore Marine Electronics PTY Ltd., Sandringham
- Oku Den, Hurstbridge
- Old Victorian Fencing, AirportWest
- Old World Restoration & Picket Fences, Newport
- Olssons Pacific Salt, North Melbourne
- Omicron Controls, Dandenong
- Omnitex Industries, Hallam
- Omron Healthcare Australia, Port Melbourne
- OnSite Recruitment, Truganina
- One Stop Warehouse, Dandenong South
- Onlineplus, Lithgow
- Ooh La La Fashion Accessories, Narre Warren
- Opal Financial Advice, Lavington
- Open Earth Consulting, Melbourne
- OpenFab, Footscray
- Orbitz Elevators Melbourne, Kew
- Orion Electronic Equipment Pty Ltd, Cranbourne West
- Osborne Video Productions, Dandenong
- Oscar's Commercial Catering Equipment, Keysborough
- Ostara Australia, Heidelberg
- Otter, South Victoria
- Otter Fencing, Dandenong South
- OurPCB Australia, Seaford
- Outback Earthworks Pty Ltd, Hawkesbury
- Outland Engineering, Coolaroo
- Outlook Employment, Cranbourne
- Outlook Employment, Narre Warren
- Outlook Employment, Pakenham
- Overseas Engineering Services, Tarneit
- Owens Corning Australia PTY Ltd., Dandenong South
- Oxworks - Fencing, Gates, Balustrades and Screens, Dandenong South
- Oz Commercial Equipment Pty Ltd, Moorabbin
- OzStaff, Dandenong
- Ozfix Fastness, Mornington