| R-Next | Colombia | — | 1 | — |
| R74n | United States | May 2, 2017 | 2 | 1 |
| Rabén & Sjögren | Sweden | 1942 | — | 1 |
| RAC7 Games | Canada | 2014 | 1 | 1 |
| Racjin | Japan | April 17, 1995 | 12 | — |
| Radarsoft | Netherlands | 1984 | 20 | 6 |
| Radiangames | United States | March 2010 | 1 | — |
| Radical Entertainment | Canada | September 1991 | 18 | — |
| Radical Forge | United Kingdom | October 13, 2016 | 1 | — |
| RageSquid | Netherlands | 2011 | 2 | — |
| Rain Entertainment | Japan | February 2004 | 1 | 1 |
| Rain Games | Norway | 2010 | 4 | 2 |
| Rainbird Software | — | 1986 | 1 | 1 |
| Rainbow Arts | Germany | 1984 | 3 | 2 |
| Rainbow Studios | United States | 1996 | 9 | — |
| Rainy Frog | Japan | — | — | 5 |
| Raiser Games | Spain | — | — | 3 |
| Rake in Grass | Czech Republic | 2000 | 4 | 2 |
| RandomSpin Games | Moldova | — | — | 2 |
| Rapid Snail | Ukraine | 2015 | 1 | — |
| Rare Ltd. | United Kingdom | 1985 | 45 | 3 |
| Rarebyte | Austria | 2006 | 1 | — |
| Rat Cliff Games | Spain | — | 1 | — |
| Rat Tower | Austria | 2021 | 1 | — |
| Ratalaika Games | Spain | May 14, 2013 | 15 | 83 |
| Raven Software | United States | 1990 | 19 | — |
| Ravensburger Interactive Media | Germany | February 27, 1992 | — | 1 |
| Ravenscourt | Austria | — | — | 16 |
| Ravn Studio | Norway | April 10, 2002 | 1 | — |
| Raw Fury | Sweden | 2015 | — | 26 |
| Raw Thrills | United States | 2001 | 3 | 2 |
| Rayark Inc. | Taiwan | September 2011 | 1 | — |
| Raylight Games | Italy | 2000 | 1 | — |
| Razorback Developments | United Kingdom | 2003 | 1 | — |
| Razorworks | United Kingdom | 1996 | 1 | — |
| Razzart Visual | United States | 2002 | 1 | 1 |
| RDI Video Systems | United States | 1982 | 1 | — |
| Re-Logic | United States | 2011 | 2 | 1 |
| Ready at Dawn | United States | 2003 | 3 | — |
| Reakktor Media | Germany | 1991 | — | — |
| Reality Labs | United States | 2020 | — | 2 |
| Reality Pump Studios | Poland | 2003 | 4 | — |
| Realmforge Studios | Germany | 2008 | 3 | — |
| Realtime Associates | United States | 1986 | 9 | — |
| Realtime Worlds | United Kingdom | 2002 | 1 | — |
| Rebellion Developments | United Kingdom | 1992 | 26 | 10 |
| Recloak | Poland | — | 2 | 2 |
| Reco Technology | Spain | — | 2 | 2 |
| Recreate Games | South Korea | — | 1 | — |
| Red Art Games | France | December 18, 2017 | — | 9 |
| Red Barrels | — | 2011 | 5 | 5 |
| Red Beard Games | United Kingdom | — | 1 | — |
| Red Candle Games | Taiwan | September 2015 | 1 | 1 |
| Red Dot Games | Poland | — | 4 | — |
| Red Ego Games | United Kingdom | January 20, 2020 | 2 | 1 |
| Red Entertainment | Japan | 1976 | 21 | 1 |
| Red Games Co. | United States | 2018 | 4 | 1 |
| Red Hook Studios | Canada | 2013 | 2 | 2 |
| Red Limb Studio | Poland | 2016 | 2 | 2 |
| Red Martyr Entertainment | Croatia | 2019 | 3 | 2 |
| Red Orb Entertainment | United States | 1997 | 1 | 4 |
| Red Phantom Games | United Kingdom | — | 1 | — |
| Red Storm Entertainment | United States | 1996 | 11 | 4 |
| Red Thread Games | Norway | September 5, 2012 | 1 | — |
| Redblack Spade | Russia | — | 1 | — |
| RedDeerGames | Poland | — | 1 | 23 |
| Redhill Games | Finland | — | 1 | 1 |
| RedLynx | Finland | 2000 | 6 | 1 |
| RedOctane | United States | 1999 | — | 2 |
| Reflexive Entertainment | United States | 1997 | 8 | 9 |
| Regista | Japan | 2004 | 2 | 1 |
| Rejected Games | Poland | 2012 | 1 | — |
| Rejet | Japan | June 5, 2009 | 7 | — |
| Rekka Games | France | November 15, 2022 | 1 | — |
| Rekoo | People's Republic of China | August 21, 2007 | 1 | — |
| Relative Software | Canada | 2017 | 1 | 1 |
| Relevo | Spain | 2009 | 1 | — |
| Reliance Games | — | 2006 | 1 | 1 |
| REMIMORY | South Korea | June 2, 2014 | 5 | 4 |
| Render Cube | Poland | — | 1 | — |
| Renegade Kid | United States | 2007 | 3 | — |
| Renegade Software | United Kingdom | 1990 | — | 1 |
| Reperio Studios | Sweden | July 2016 | 1 | 1 |
| Repixel8 | United Kingdom | — | 3 | 3 |
| Replay Studios | Germany | 2002 | 1 | — |
| Reply Game Studios | Italy | — | 1 | — |
| Resnijars | Canada | — | 4 | 4 |
| Resolution Games | Sweden | 2015 | 8 | 6 |
| Respawn Entertainment | United States | 2010 | 6 | — |
| Retrific | Germany | March 2013 | 4 | 3 |
| Retro Studios | United States | October 1998 | 9 | — |
| RetroSoft Studios | United States | 2018 | 1 | 1 |
| Retrotainment Games | United States | — | 1 | — |
| Reverb Publishing | United States | — | — | 2 |
| Revolt Games | France | April 19, 2019 | 1 | — |
| Revolution Software | United Kingdom | 1990 | 11 | 3 |
| Revulo Games | Poland | — | 3 | 3 |
| Rewind Games | Canada | — | 1 | — |
| RFX Interactive | France | August 10, 1998 | 2 | — |
| Rhythm and Hues Studios | United States | 1987 | 1 | — |
| Rikodu | Romania | — | 1 | 1 |
| Ringier Axel Springer Polska | Poland | 1994 | — | 2 |
| Riot Forge | — | — | — | 3 |
| Riot Games | United States | 2006 | 2 | 3 |
| Ripple Effect Studios | United States | 2013 | 1 | — |
| Ripstone | United Kingdom | February 2011 | 2 | 4 |
| Rising Moon Games | Brazil | — | 1 | — |
| Rising Star Games | United Kingdom | 2004 | — | 16 |
| Rising Win Tech. Co., Ltd. | Taiwan | September 26, 2016 | — | 2 |
| Ritual Entertainment | United States | 1996 | 4 | — |
| Rival Games | Finland | March 2013 | 1 | 1 |
| Riverhillsoft | Japan | 1982 | — | 1 |
| Robomodo | United States | January 7, 2008 | 4 | — |
| Robot Entertainment | United States | 2009 | 4 | 1 |
| Robot House Games | United Kingdom | September 24, 2012 | 1 | 1 |
| Robot Invader | United States | 2011 | 1 | 1 |
| Robot Teddy | United Kingdom | 2019 | 1 | 1 |
| RobTop Games | Sweden | March 8, 2012 | 2 | 3 |
| Rock-Ola | United States | 1927 | 1 | 2 |
| Rocket Adrift | Canada | — | 1 | — |
| Rocketcat Games | United States | — | 4 | 4 |
| RocketWerkz | New Zealand | 2014 | 1 | 1 |
| Rockhead Studios | Brazil | 2011 | 1 | 1 |
| Rockstar Lincoln | United Kingdom | 1992 | 2 | — |
| Rockstar London | United Kingdom | 2005 | — | — |
| Rockstar New England | United States | 1999 | 5 | — |
| Rockstar Toronto | Canada | 1980 | 2 | — |
| Rockstar Vancouver | Canada | 1998 | 3 | — |
| Rockstar Vienna | Austria | 1993 | 2 | — |
| Rocksteady Studios | United Kingdom | December 13, 2004 | 6 | — |
| Rogue Entertainment | United States | 1994 | 1 | — |
| Rogue Games | United States | 2018 | — | 10 |
| Roll7 | United Kingdom | — | 3 | — |
| Romstar | United States | 1984 | — | 6 |
| Ronimo Games | Netherlands | 2007 | 5 | 3 |
| Room 8 Studio | — | 2011 | 1 | — |
| Room-C Games | Croatia | — | 1 | — |
| Roomah Games | Malaysia | 2020 | 1 | 1 |
| Roost Games | Netherlands | — | 1 | — |
| Rooster Teeth Games | — | 2017 | 1 | 1 |
| Rootless Studio | South Korea | — | 1 | — |
| Rose-engine | Germany | — | 1 | — |
| Roseverte | — | — | 14 | 14 |
| Rotu Entertainment | United States | 2012 | 1 | 1 |
| Round 2 Games | Ecuador | — | 1 | 1 |
| Rowan Software | United Kingdom | 1987 | 1 | — |
| Roxor Games | United States | — | 1 | — |
| Royal Industries | Japan | 1964 | 1 | 1 |
| Ruby Party | Japan | 1990 | 4 | — |
| RumbleSushi | United Kingdom | 2010 | — | — |
| Rundisc | France | October 9, 2018 | 1 | — |
| Runecraft | United Kingdom | 1997 | — | 1 |
| Runic Games | United States | 2008 | 2 | 1 |
| Runner Duck | United Kingdom | 2017 | 1 | — |
| Running with Scissors | United States | 1996 | 17 | 15 |
| RunServer | Ukraine | — | 5 | 20 |
| Russobit-M | Russia | 1999 | — | 12 |
| Rusty Lake | Netherlands | April 25, 2015 | 17 | 10 |
| Rutubo Games | Japan | — | 1 | — |
| Ryu ga Gotoku Studio | Japan | August 31, 2011 | 12 | — |