| A Game of Thrones | 2005 | Guardians of Order | Canada |
| A Penny for My Thoughts | 2009 | Evil Hat Productions | United States |
| A Song of Ice and Fire Roleplaying | 2009 | Green Ronin Publishing | United States |
| A Thousand and One Nights: A Game of Enticing Stories | 2006 | Night Sky Games | United States |
| Aberrant | 1999 | White Wolf Publishing | United States |
| Abstract Dungeon | 2014 | — | — |
| Abyme | 2010 | Les XII Singes | France |
| Aces & Eights: Shattered Frontier | 2007 | Kenzer & Company | United States |
| Achtung Cthulhu! | 2014 | Target Games | Sweden |
| Acirema | 1986 | — | Finland |
| Active Exploits | 2002 | — | — |
| Acts of Evil | 2007 | Half Meme Press | United States |
| Advanced Dungeons & Dragons (1st edition) | 1977 | TSR | United States |
| Advanced Dungeons & Dragons (2nd edition with Players's Option) | 1995 | TSR | United States |
| Advanced Dungeons & Dragons (2nd edition) | 1989 | TSR | United States |
| Advanced Fighting Fantasy | 1989 | — | United Kingdom |
| Adventure Time: The Roleplaying Game | 2016 | — | — |
| Adventure! | 2001 | White Wolf Publishing | United States |
| Adventure! | 1985 | — | — |
| Adventures in Fantasy | 1979 | — | — |
| Adventures in Middle-earth | 2016 | Cubicle 7 | United Kingdom |
| After the Bomb | 1986 | Palladium Books | United States |
| Aftermath! | 1981 | Fantasy Games Unlimited | United States |
| Against the Darkmaster | 2021 | — | — |
| Age of the Tempest | 2013 | — | Finland |
| Agon | 2006 | — | — |
| Agon (1st edition) | 2006 | — | United States |
| Agon (2nd edition) | 2020 | Evil Hat Productions, One Seven Design | United States |
| Agone | 1999 | Multisim | France |
| Albedo | 1988 | Sage Kobold Productions | United States |
| Alice is missing | 2020 | — | — |
| Alien: The Role-Playing Game | 2019 | Free League Publishing | Sweden |
| Alienoïds | 1993 | — | France |
| Aliens Adventure Game | 1991 | — | — |
| All Flesh Must Be Eaten | 1999 | Eden Studios, Inc. | United States |
| All Outta Bubblegum | 2001 | — | — |
| Alma Mater | 1982 | — | — |
| Almogàvers | 1995 | Joc Internacional | Spain |
| Alshard | 2002 | — | Japan |
| Altered Carbon: The Roleplaying Game | 2020 | — | — |
| Alternity | 1998 | TSR | United States |
| Always/Never/Now | 2013 | self-published work | — |
| Amazing Engine | 1993 | — | — |
| Amber Diceless Role-Playing Game | 1991 | Phage Press, Jeux Descartes, Palladium Books, Guardians of Order | United States |
| Amethyst RPG | 2010 | — | — |
| Ancestry | 2001 | — | Italy |
| Angel Gear | 2008 | Enterbrain | Japan |
| Angel Roleplaying Game | 2003 | Eden Studios, Inc. | United States |
| Anima: Beyond Fantasy | 2005 | — | United States |
| Animonde | 1988 | — | France |
| ANKH | 1988 | Tactic Games | Finland |
| Anno Domin 50 | — | — | Finland |
| Aphalon | 1995 | — | Poland |
| Apocalypse World | 2010 | Lumpley Games | United States |
| Apocalypse World (1st ed.) | 2010 | Lumpley Games | United States |
| Apocalypse World (2nd ed.) | 2016 | Lumpley Games | United States |
| Aquelarre | 1990 | Nosolorol Ediciones | Spain |
| Aquelarre (3rd edition) | 2011 | Nosolorol Ediciones | — |
| ARC: Doom Tabletop RPG | 2021 | — | — |
| Arcana Mvndi | 2008 | — | — |
| Arcana Unearthed | 2003 | Malhavoc Press | United States |
| Arcane Codex | 2002 | — | Germany |
| Arcanis | 2011 | — | — |
| Archaeron | 1980 | — | — |
| Archipelago | 2007 | — | — |
| Archipels (D20 system) | 2001 | Oriflam | France |
| Archmage Engine | 2013 | — | — |
| Arduin | 1977 | Grimoire Games | United States |
| Argonauts | 2003 | self-publishing | — |
| Aria: Canticle of the Monomyth | 1994 | — | — |
| Arianrhod RPG | 2004 | — | — |
| Arkeos | 2004 | Extraordinary Worlds Studio | France |
| ArKipels² | 2013 | — | France |
| Armageddon: 2089 | 2003 | — | — |
| Armageddon: The End Times | 2003 | Eden Studios, Inc. | United States |
| Armored Trooper VOTOMS: The Roleplaying Game | 1997 | — | — |
| Arms Law | 1979 | Iron Crown Enterprises | United States |
| Army of Darkness Roleplaying Game | 2005 | Eden Studios, Inc., Dynamite Entertainment | United States |
| Ars Magica | 1987 | Lion Rampant | United States |
| Ars Magica (1st edition) | 1987 | — | — |
| Ars Magica (2nd edition) | 1989 | — | — |
| Ars Magica (3rd edition) | 1992 | — | — |
| Ars Magica (4th edition) | 1996 | Atlas Games | United States |
| Ars Magica (5th edition) | 2004 | — | — |
| Artesia: Adventures in the Known World | 2005 | — | — |
| Ashen Stars | 2011 | Pelgrane Press | United States |
| Astraterra | 2014 | Ironspine | Finland |
| Asylum | 1996 | — | — |
| Athanor | 1989 | — | France |
| Attack of the Humans | 1990 | — | — |
| Aux Armes, Citoyens ! | 1988 | — | France |
| Aux Marches du Pouvoir | 2017 | — | France |
| Avant Charlemagne | 1986 | Robert Laffont | France |
| Avatar Legends: The Roleplaying Game | February 2022 | Magpie Games | United States |
| Aventuras en la Marca del Este | 2010 | — | Spain |
| Aventures merveilleuses | 2006 | Le Septième Cercle | France |
| A|State | 2003 | — | — |