Business Services Company Index - O
- Oaktree Executive Ltd. - Yateley
- Occam Digital Ltd - Watford
- Occhnet Ltd - Carmarthen
- Occupational Medicals Ltd. - Manchester
- Oceanside Business Machines - Redruth
- OCS Group UK Ltd - Crawley
- Octink - Brentford
- OdourNet UK Ltd - Bradford on Avon
- Office Futures - Oxted
- Office Interiors Ltd - Keighley
- Office Planet Ltd. - London
- Office Style Ltd - Hatfield
- Office-Seats.co.uk Ltd - Aylesford
- Officemagic co uk - Ashford
- Oftec Services - Dundee
- Oil Productions Ltd - London
- OKI Buyer - Cambridge
- Olympic Staff Agency - London
- Omagh Enterprise Co Ltd - Omagh
- Omega Accountants Ltd. - Croydon
- Omega Partnership - Liverpool
- Omega2 Web Design - Twickenham
- One Stop Office Supplies Ltd. - Edinburgh
- One Stop Promotions Ltd. - Loughborough
- One to One Office Solutions Ltd. - Godstone
- Oniva Ltd - Bembridge
- Opal Telecom - Warrington
- Open Connections Solutions Ltd. - Bristol
- Open Telecom International Ltd. - Bodmin
- Optima Training (UK) Ltd - Newark
- Options Employment Ltd - Hounslow
- Opus 4 Logistics Ltd - Hyde
- Opus Energy Ltd - Northampton
- Opus Staff Ltd - Belfast
- Orbsen Consulting - Dungarvan
- Organic Development Ltd - Exeter
- Orient Direct Ltd. - Manchester
- Oryx (Executive Search) Ltd. - Bristol
- Osi Business Supplies Ltd. - Chesterfield
- OTR Couriers Ltd - Southampton
- Outmere Direct Mail Ltd. - London
- Outspoken Delivery Llp - Cambridge
- Over2Hills - Cleckheaton
- Overload Trade Services - Abingdon
- Owen Gordon P - Barking
- Owen Kerr Signs - Ayr
- Oxford Holt and Company Ltd - Cleckheaton
- Oyster Risk Solutions Ltd (Southampton) - Southampton