Ocean Software
- Based in
- Manchester
- Founded
- 1983
Onion Soup Interactive
- Games in the catalogue
- 1
- Country
- United Kingdom
Onteca (United Kingdom)
- Based in
- Liverpool
- Founded
- 2001
Orthrus Studios
- Based in
- Dundee
- Founded
- 2017
OutOfTheBit
- Based in
- London
- Founded
- 18 December 2008
Outright Games
- Founded
- 2016
- Country
- United Kingdom
Oversight Productions
- Based in
- London
- Founded
- 28 August 2019
Oxygen Studios
- Based in
- Croydon
- Founded
- 2007