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Full A-Z Company listing
| O2 (UK) Ltd | Slough |
| The Observer | London |
| OC Group | East Cowes |
| OCS Group Ltd | Morcambe |
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Octagon | London |
| The Oddfellows | Manchester |
| Ofcom (the Office of Communications) | London |
| Office Angels Ltd | London |
| Oki Systems (UK) Ltd | Slough |
| Old Mutual plc | London |
| Oliver Sweeney Ltd | Newton Abbot |
| Olympus (UK) Ltd | London |
| On Line Broadcasting Ltd | London |
| One Move | Richmond |
| One NorthEast | Newcastle upon Tyne |
| One Railway | Norwich |
| One Spa | Edinburgh |
| Onside Law LLP | London |
| Ontrack Marketing Ltd | London |
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Open Air Theatre, Regent's Park | London |
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Open House | London |
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Open House | London |
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OPLdigital | Sevenoaks |
| Optical Express | Glasgow |
| Orange UK Ltd | Hertford |
| Organix Brands Ltd | Christchurch |
| Osborne Refrigerators Ltd | Bognor Regis |
| Outward Bound Trust | London |
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