| Oakfield School - General secondary education |
| Oakhill Mortgage Services - Other credit granting |
| Oakridge Brick Work - Other construction work involving special trades |
| Ochre - Retail sale of clothing |
| Ockham Park Stables - Other sporting activities |
| Office Angels - Labour recruitment and provision of personnel |
| Office Ours Recruitment Ltd - Labour recruitment and provision of personnel |
| Office Partners Ltd - Other business activities not elsewhere classified |
| Office Response - Secretarial and translation activities |
| Oil & Gas Project Consultants Ltd - Extraction of crude petroleum and natural gas |
| Old Woking Cricket Club - Bar |
| Old Woking District Recreation Club - Bar |
| Old Woking Post Office - National post activities |
| Old Woking & District Community Association - Catering |
| Old Woking & District Recreation Club Ltd - Bar |
| Olivo Restaurants Ltd - Restaurant |
| Once Upon A Time - Other retail sale in specialised stores |
| One Health - Medical practice activities |
| One Source Information Services Ltd - Other business activities not elsewhere classified |
| One Step Ahead - Hairdressing and other beauty treatment |
| One Stop Mobility - Manufacture of invalid carriages |
| Open Contracts - Manufacture of other office and shop furniture |
| Opportunities Press - Publishing of newspapers |
| Optichrome Computer Systems - Pre-press activities |
| Optichrome Ltd - Pre-press activities |
| Opus 4 Solutions Ltd - Other business activities not elsewhere classified |
| Orange Coach Travel - Other scheduled passenger land transport |
| Orchard Communications - Radio and television activities |
| Organisational Development Through People - Business and management consultancy activities |
| Original Wheat Bag Co Ltd - Physical well-being activities |
| Ornate Products - Other manufacturing not elsewhere classified |
| Osteopathic Surgery - Other human health activities |
| Ottakar's PLC - Retail sale of books, newspapers and stationary |
| Our Lady Mother Of God R C Church - Activities of religious organisations |
| Outline - Other human health activities |
| Ovenu Domestic Oven Valeting - Industrial cleaning |
| Oxfam - Social work activities without accommodation |
| O2 Store - Telecommunications |
| O'keeffe & Co - Legal activities |
| O'Neill's - Bar |
| O'Sullivan Last & Co - Legal activities |
| Oak Ride Kennels - Boarding Kennels & Catteries |
| One Step Ahead - Hairdresser |
| Ottaker S - Book Retailers |
| Ottakar's - Retailers Of Books |
| Oaks 2000 - Florist |
| Oxus Services Ltd - Gold And Base Metal Mining And Support Services |
| Olympus Trophies - Trophies Medals And Rosettes |
| O'keeffe & Co - Solicitors |
| O'sullivan Last & Co. - Solicitors |
| Oresome Metalworks Ltd - Metal Door, Window & Screen Mfrs |
| Oromia Ltd - Coffee House |
| One Stop Mobility Ltd - Retailers Of Disability Products |
| Obencars Ltd - Taxi Service |