| Company | Country | Founded | Games developed | Games published |
|---|---|---|---|---|
| Q Entertainment | Japan | 2003 | 5 | — |
| Q-Games | Japan | August 9, 2001 | 12 | 7 |
| Q-X | — | — | 1 | 1 |
| Qene Games | Ethiopia | 2016 | 2 | — |
| QLOC | Poland | 2009 | 6 | — |
| QualiArts | Japan | 2016 | 2 | 1 |
| Quantic Dream | France | 1997 | — | 1 |
| Quantum Giant | United States | 2016 | 1 | — |
| Quazar Studio | Russia | 2003 | 1 | — |
| QubicGames | Poland | 2004 | — | 4 |
| QUByte Interactive | Brazil | — | 1 | 40 |
| Quest | Japan | 1988 | 7 | 2 |
| Question | United States | 2013 | 1 | — |
| Quicksilver Software | United States | 1984 | 3 | — |
| Quin Rose | — | 2005 | 1 | 2 |
| Quintet | Japan | April 1989 | 4 | — |
| Quite Interesting Limited | United Kingdom | 1999 | 1 | — |
| Qureate | Japan | October 25, 2021 | 5 | 6 |