101 Computers
- Online store for used computers and notebooks.
- http://www.101computers.com/

Online Systems
- Suppliers of computer hardware and software.
- http://www.onlinesystems.co.uk/

OutletPC.com
- Sells computer components, accessories, barebones and systems.
- http://www.outletpc.com

Office Online Limited
- Sells laptop computers, printers and digital cameras in the UK.
- http://www.office-online.co.uk

OfficeSoftware
- Offers computer hardware and software.
- http://www.officesoftware.com.au

Oneilonline.com
- Computer store and support, with Web design offered.
- http://www.oneilonline.com

Opas IT Computer Solutions
- Offers computer training, consultancy, parts and accessories.
- http://www.opasit.com

Ovausa.com
- Resource for computers and peripherals.
- http://ovausa.com

100Nel Computer Connection
- Computers and systems from major brands.
- http://www.100nel.com

One Stop Computers
- Supplier of hardware, software and components.
- http://www.onestop.co.sz

Orient Technologies
- Retailer of computer systems, peripherals and software design.
- http://www.orientindia.com/

On Call Computer Supply
- Computer hardware, software and accessories. (popups on exiting)
- http://www.oncallcomputer.com/

On-Line Designs
- Computer and network sales and service, serving the Los Angeles area.
- http://www.online-designs.com

OCLA Distributing
- Retailer for computer related office supplies and peripherals.
- http://www.ocla.com

Overdrive PC
- Retailer of custom built gaming computer systems and peripherals.
- http://www.overdrivepc.com

Orange Computers
- Custom built computers and peripherals with online system configuration/pricing utility.
- http://www.orangecom.com