| Altered Matter | DeveloperPublisher | |
| Alterego Games | Developer | |
| Altergaze | Developer | |
| Alterisateur | Developer | |
| Alternative Software | DeveloperPublisher | |
| Alternative Software Ltd. | Publisher | |
| AltezaTFE | Developer | |
| Althi | DeveloperPublisher | |
| Altron | DeveloperPublisher | |
| Altron (JP) | Publisher | |
| Altron JP | Publisher | |
| AltronJP | Publisher | |
| Alucine Soft | Developer | |
| Alucine Software (Francisco Javier Perez Aguilera, Ricardo Perez Aguilera, Armando Garcia) | Developer | |
| Alukard9112 | Developer | |
| Alvar0gamer | Developer | |
| Alvaro Caceres | Developer | |
| Alvaro Luque | Developer | |
| Alvaro Marco | Developer | |
| Alvaro Mateos Herrera | Developer | |
| Alvaro Perez | Developer | |
| AlvaroVilla | Developer | |
| Alvarop | Developer | |
| Alvarop Games | Developer | |
| Alventia | Developer | |
| Alvian Eka | Developer | |
| Alvion | DeveloperPublisher | |
| Alyssa Williams | Developer | |
| AlyssonMax | Developer | |
| Alyx Jones | Developer | |
| Alzhar | Developer | |
| Am.Hyde | Developer | |
| Amaia Ruiz | Developer | |
| Amaka94 | Developer | |
| Amalie Kae | Developer | |
| Aman | Developer | |
| Amanda | Developer | |
| Amanda Hackbardt | Developer | |
| AmandaColer | Developer | |
| Amandhe | Developer | |
| Amanita Design | DeveloperPublisher | |
| Amaranthine | Developer | |
| Amarikwa | Developer | |
| Amaweks | Developer | |
| Amaze | Developer | |
| Amaze Entertainment | Developer | |
| AmazengGrace | Developer | |
| Amazing | DeveloperPublisher | |
| Amazing Games | Developer | |
| Amazing Media | Developer | |
| Amazing Soul Games | Developer | |
| Amazing Studio | Developer | |
| Amazing Studios | Developer | |
| Amazon | Publisher | |
| Amazon Game Studios | Developer | |
| Amazon Systems | Developer | |
| Amazura | Developer | |
| Amber | Developer | |
| Amber Smith | Developer | |
| AmberDrop | Developer | |
| AmberIsAQT | Developer | |
| Ambient Melancholy | Developer | |
| Amble | Developer | |
| Amblin Entertainment | Developer | |
| Ambrella | Developer | |
| Ambrosia Software | DeveloperPublisher | |
| Ambrosio | Developer | |
| Amedio | Developer | |
| Amegatron | Developer | |
| Amegpo | Developer | |
| AmelieBy | Developer | |
| Amelyse | Developer | |
| Amenip | Publisher | |
| Ameri | Publisher | |
| America Online | Publisher | |
| American Laser Games | DeveloperPublisher | |
| American Laser Games, Inc. | Developer | |
| American Sammy | DeveloperPublisher | |
| American Sammy NA | Publisher | |
| American Software Laboratories | Publisher | |
| American Softworks | DeveloperPublisher | |
| American Softworks (Cannondale Cup) | Publisher | |
| American TechnÅs (NA) | Publisher | |
| Americana | Publisher | |
| Americana Software | Publisher | |
| Ames Mutton | Developer | |
| AmesyFlo | Developer | |
| Amewater98 | Developer | |
| Amheklerior | Developer | |
| Ami C | Developer | |
| Amicable Animal | Developer | |
| Amin Montazeri | Developer | |
| Amir | Developer | |
| Amir Bayareh | Developer | |
| Amir Matouk | Developer | |
| AmirHammoutene | Developer | |
| Amit Netanel | Developer | |
| Amjad | Developer | |
| AmmoBanditBonzo | Developer | |
| Amnesty Design | Developer | |