Companies catalogue
- O'Connell Group, Sydney
- O'halloran Fire & Medical, Horsley Park
- OAKVILLE PLAYSCHOOL - childcare centre & pre-school, Oakville
- OCON Services, Botany
- OCTEC Employment Service, Richmond
- OCTEC Employment Service, Springwood
- OCTEC Employment Service, Dee Why
- OKUL DRIVING SCHOOL, Auburn
- OPTIC WAREHOUSE, Ultimo
- ORNT Elevators, Lane Cove West
- ORS Group, Bankstown
- ORS Group, Busby
- ORS Group, Parramatta
- ORS Group, Woy Woy
- ORS Group, Ryde
- ORS Group, Gosford
- ORS Group, Liverpool
- ORS Group, Campsie
- OWAD Environment, Thorneside
- OZ Education Childcare Centre, Putney
- OZ Hair & Beauty PTY LTD, Miranda
- OZZIE JOBS, Grays Point
- Oakhill Drive Public School, Castle Hill
- Oakville Preschool Learning Centre, Oakville
- Oakville Public School, Oakville
- Oatley Public School, Oatley
- Obley Education Centre, Saint Marys
- Odd Job Services, Freemans Reach
- Oerlikon Metco, Bella Vista
- Ogalo, Bankstown
- Ogalo, Lindfield
- Ogalo Rockdale, Rockdale
- Ogero Civil, Badgery’s Creek
- Old Toongabbie Zone Substation, Old Toongabbie
- Olectric Systems Pty Ltd, Gladesville
- Oliver Electric Co PTY Ltd., Manly Vale
- Olympus Solutions, Baulkham Hills
- Olympus Solutions, Ryde
- Omnihealth, Marrickville
- One Door Mental Health Care, Burwood, Burwood
- One Door Mental Health Care, Campbelltown, Campbelltown
- Online Now, Chippendale
- Onlinesoft Pty Ltd - Turning Clicks into Customers, Mascot
- Only Organic Soap, East Killara
- OnlyPOS, North Sydney
- Onroad Driving School Sydney, The Ponds
- Optic Electric Pty Ltd, Artarmon
- Oran Park Zone Substation, Oran Park
- Oran Park Zone Substation, Oran Park
- Orana Inc, Sutherland
- Orchard Hills Public School, Orchard Hills
- Oriental Dumpling King, Haymarket
- Outdoor Access Pty Ltd, Church Point
- Ouzo Mezze Bar, Surry Hills
- Owens Lawyers, Parramatta
- Oxford Electrical Group, Silverwater
- Oxford Greens Early Education Centre, Bass Hill
- Oyster Bay Public School PRIMARY, Oyster Bay
- Oz Turners, Kingston
- Oz digitizing, Castle Hill
- OzLinc Industries, Wacol
- Ozemed, Penrith