| NEC PC-9801 Series 3.5in. disk |  Janou Touryuumon II | 1991 | Game Arts Co., Ltd. Japan |
| Sega Mega Drive cart. | Jantei Monogatari | 1991 | Renovation Products USA |
| Amstrad CPC pack. |  Jaws | 1991 | EDOS Electronic Distribution of Software |
| Nintendo Super NES cart. | Jelly Boy | 1991 | Ocean Soft., Ltd. 13156 |
| Nintendo Game Boy Cart. | Jelly Boy Model DMG-AJBP-UKV | 1991 | Ocean Soft., Ltd. 13156 |
| Sinclair ZX Spectrum+3 disk | Jenny's Big Disk Vol. 1 | 1991 | Zenobi Soft. |
| Sinclair ZX Spectrum+3 disk | Jenny's Next Big Disk Vol. 1 | 1991 | Zenobi Soft. |
| Nintendo Game Boy Cart. | Jeopardy! Model DMG-JP-USA | 1991 | GameTek, Inc. Miami Beach, FL, USA 43948 |
| Nintendo Super Famicom cart. | Jerry Boy Model SHVC-JB | 1991 | Epic/Sony Records Sony Music Ent., Inc. Japan |
| Sinclair ZX Spectrum cass. | Jester's Jaunt | 1991 | Zenobi Soft. |
| NEC PC-8801mkIISR disk | Jesus II Model E-G258 | 1991 | Enix, Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Jesus II Model E-G259 | 1991 | Enix, Ltd. Japan |
| NEC PC-9801 Series 3.5in. disk | Jesus II Model E-G260 | 1991 | Enix, Ltd. Japan |
| Sharp X68000 Series 5.25in. disk | Jesus II Model E-G261 | 1991 | Enix, Ltd. Japan |
| Nintendo Game Boy Cart. |  Jet Pak Jak | 1991 | Unknown |
| Nintendo Game Boy Cart. | Jet Pak Man | 1991 | Unknown |
| Amstrad CPC pack. | Jet Set Willy | 1991 | EDOS Electronic Distribution of Software |
| Nintendo Game Boy Cart. | Jetpack | 1991 | JALECO Co., Ltd. Japan |
| Amstrad CPC type-in | Jeu des Petits Chevaux | 1991 | Editions SORACOM France |
| Sega Genesis cart. | Jewel Master | 1991 | SEGA of America, Inc. San Francisco, CA, USA |
| Sega Mega Drive cart. | Jewel Master Model G-4047 | 1991 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Medal game (mechanical) | Jewelry Gold | 1991 | Taito Corp. Japan |
| Nintendo Game Boy Cart. | Jikuu Senki Mu Model DMG-H1J | 1991 | Hudson Soft. Hudson Group Japan |
| Commodore Amiga 500 disk | Jimmy White's Whirlwind Snooker | 1991 | Virgin Interactive Ent., Ltd. UK 013715 |
| Atari ST disk | Jimmy White's Whirlwind Snooker | 1991 | Virgin Games, Ltd. UK 013715 |
| Sinclair ZX Spectrum cass. | Jimmy's Soccer Manager | 1991 | Beyond Belief Soft. |
| Nintendo Game Boy Cart. | Jinsei Game Densetsu Model DMG-JGJ | 1991 | Takara Co., Ltd. Japan |
| Sinclair ZX Spectrum cass. | Jocky Wilson's Compendium of Darts | 1991 | Zeppelin Games |
| Amstrad CPC 464 disk | Jocky Wilson's Compendium of Darts | 1991 | Zeppelin Games |
| Amstrad CPC pack. | Jocky Wilson's Compendium of Darts Model 209 | 1991 | EDOS Electronic Distribution of Software |
| Commodore Amiga 500 pack. | Jocky Wilson's Compendium of Darts Model 209 | 1991 | EDOS Electronic Distribution of Software |
| Atari ST pack. | Jocky Wilson's Compendium of Darts Model 209 | 1991 | EDOS Electronic Distribution of Software |
| Sinclair ZX Spectrum pack. | Jocky Wilson's Compendium of Darts Model 209 | 1991 | EDOS Electronic Distribution of Software |
| Commodore C64 pack. | Jocky Wilson's Compendium of Darts Model 209 | 1991 | EDOS Electronic Distribution of Software |
| Sinclair ZX Spectrum+3 disk | Jocky Wilson's Compendium of Darts Tape Master Disk | 1991 | Zeppelin Games |
| Amstrad CPC cass. | Jocky Wilson's Darts Challenge Model A058 | 1991 | Zeppelin Games |
| Atari 400/800 disk | Jocky Wilson's Darts Compedium | 1991 | Zeppelin Games |
| Commodore C64 cass. | Jocky Wilson's Darts Compendium | 1991 | Zeppelin Games |
| Sega Genesis cart. | Joe & Mac | 1991 | Takara USA Corp. New York, NY, USA 26483 |
| IBM PC/AT DOS 3.5in. disk | Joe & Mac - Caveman Ninja | 1991 | New World Computing, Inc. |
