Dreamcast - A
- A Life
- A-Life
- A-Life (VMS)
- Advanced Daisenryaku
- Advanced Daisenryaku - Europe No Arashi
- Advanced Daisenryaku - Europe no Arashi - Doitsu Dengeki Sakusen
- Aero Dancing
- Aero Dancing - Featuring Blue Impulse
- Aero Dancing F
- Aero Dancing Special
- Aero Wings
- Aero Wings 2
- Aero Wings 2 - Airstrike
- Aerowings
- Aerowings 2
- AeroWings 2 - Airstrike
- Air Force Delta
- Airforce Delta
- Alien Front Online
- Alone in the Dark - the new Nightmare
- Altered Beast - Sega SP Vol1
- American Pro Trucker
- Anima Star
- Aqua GT
- Armada
- Army Men - Sarge's Heroes
- Army Men - Sarges Heroes
- AT&T Internet Disc
- Atari Anniversary Edition