| Sega Game Gear cart. |  X-Men - Gamemaster's Legacy Model 2531 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Game Gear cart. | X-Men - Mojo World Model 2561 | 1996 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. |  X-Men 2 - Clone Wars Model 1550-50 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Game Gear cart. | X-Men Model 2505 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | X-Men Model 670-2482-50 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. |  X-perts | 1996 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Arcade Video game | Yamato | 1983 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega SG-1000 game | Yamato Model G-1008 | 1983 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Medal mechanical game | Yatterman | 1997 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Medal mechanical game | Yatterman Plus | 1998 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Pico game | Yobeba Kotaeru Doraemon - Nobita to Himitsu Dougu wo Mitsukeyou! Model HPC-6041 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mark III cart. | Ys Model G-1370 | 1988 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Game Gear cart. | Yu Yu Hakusho - Horobishimono no Gyakushuu Model G-3343 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Yu Yu Hakusho - Makyou Toitsusen Model G-4122 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Game Gear cart. | Yu Yu Hakusho 2 - Gekitou! Nanakyou no Tatakai Model G-3354 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Yu Yu Hakusho Gaiden Model G-5523 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Pico game | Yukai na Mori no Packet Model HPC-6034 | 1995 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega-CD | Yumemi Mystery Mansion Model 4430 | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega-CD |  Yumemi Yakata no Monogatari Hibaihin | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega-CD | Yumemi Yakata no Monogatari Model G-6027 | 1993 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Pico game | Zai Weini Tiandilide Yinian | 1994 | SEGA Enterprises, Ltd. Tokyo, Japan |
| IBM PC 5.25in. disk | Zaxxon P | 1984 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mark III cart. | Zaxxon 3-D Model G-1336 | 1987 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Master System cart. | Zaxxon 3-D Model MK-8002-50 | 1988 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Atari 5200 cart. | Zaxxon Model 008-02 P | 1984 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Atari 400/800 cart. | Zaxxon Model 008-03 | 1983 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Arcade Video game | Zaxxon Model 834-0211 | 1982 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega SG-1000 game | Zaxxon Model G-1038 | 1985 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Arcade Video game | Zektor | 1982 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega ST-V cart. | Zen Nihon Pro Wres Featuring Virtua | 1997 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Saturn CD | Zen Nihon Pro Wres Featuring Virtua Model GS-9158 P | 1997 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega ST-V cart. | Zenkoku Seifuku Bishoujo Grand Prix - Find Love Model 610-0374-77 | 1997 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Mega Drive cart. | Zero Wing Model 670-2050-50 | 1992 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Arcade Video game | Zigzag Block | 1978 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Master System cart. | Zillion II - The Tri Formation Model MK-5105-50 | 1988 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Master System cart. | Zillion Model 5075 | 1987 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega SG-1000 game | Zippy Race Model G-1026 P | 1983 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega SG-1000 game | Zippy Race Sega My Card Model C-26 P | 1985 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega Visual Memory Unit mini-game | Zombie Revenge Training Game | 1999 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sega NAOMI cart. | Zombie Revenge Model 840-0003C | 1999 | SEGA Enterprises, Ltd. Tokyo, Japan |
