| Sega Mega Drive cart. |  Ka-Ge-Ki Model T-28013 | 1991 | Hot-B Japan |
| Redemption game (mechanical) | Kabakun no Lunch Time | 1991 | KASCO Kansai Seiki Seisakusho Co. Japan |
| Nintendo NES cart. |  Kabuki - Quantum Fighter | 1991 | Nintendo Co., Ltd. Japan |
| Nintendo NES cart. | Kabuki - Quantum Fighter Model NES-3K-USA | 1991 | HAL America, Inc. |
| Nintendo Famicom cart. | Kaiketsu Yanchamaru 2 - Karakuri Land Model IF-22 | 1991 | Irem Corp. Japan |
| NEC PC-Engine HuCARD | Kaizou Choujin Shubibinman 2 - Aratanaru Teki Model NCS91001 | 1991 | Masaya |
| Medal game (video) | Kamen Rider Racing | 1991 | Success Japan |
| Sinclair ZX Spectrum cass. | Kamikaze Model 2421 | 1991 | Codemasters Soft. Co., Ltd., The 015026 |
| Coin-op Misc. game | Kani Kani Panic | 1991 | NAMCO, Ltd. Japan |
| NEC PC-8801 Series disk | Kankoku Heigo 1991 | 1991 | Unknown Japan |
| NEC PC-9801 Series 5.25in. disk | Kao Floppy Gekijou - Route 246 Satsujin Annai | 1991 | Fairytale Japan |
| Nintendo Famicom cart. | Karakuri Kengouden Musashi Road - Karakuribito Hashiru! Model SHI-98 | 1991 | Yutaka |
| Nintendo Game Boy Cart. | Karakuri Kengouden Musashi Road Model DMG-MUJ | 1991 | Yutaka |
| VEB Mikroelektronik KC cass. | Karate | 1991 | STS Soft. |
| Arcade Video game | Karate Blazers | 1991 | Video System Co., Ltd. Kyoto, Japan |
| IBM PC 3.5in. disk | Karate King | 1991 | Ediciones Manali, S.A. |
| NEC PC-9801 Series 5.25in. disk | Kareinaru Jinsei - Minasan no Okage Desu. 18 | 1991 | Fairytale Japan |
| Acorn Archimedes disk | Karma - The Flight Trainer | 1991 | Periscope Soft. |
| Arcade Video game | Ken-Go | 1991 | Irem Corp. Japan |
| IBM PC/AT DOS 3.5in. disk | Kengi | 1991 | Software 2000, Inc. |
| Commodore C64 cass. | Kenny Dalglish Soccer Manager | 1991 | Zeppelin Games |
| Amstrad CPC pack. |  Kentucky Racing | 1991 | EDOS Electronic Distribution of Software |
| Sinclair ZX Spectrum cass. | Kentucky Racing Model AS 781 | 1991 | Alternative Soft., Ltd. |
| Nintendo Famicom cart. | Kero Kero Keroppi no Daibouken Model CTS-ZI | 1991 | Character Soft |
| IBM PC 3.5in. disk | Ketting-Puzzel | 1991 | HVB Soft. |
| Commodore Amiga 500 disk | Khalaan | 1991 | Electronic Zoo |
| NEC PC-9801 Series 5.25in. disk | Ki - Aku no RPG | 1991 | Soft Plan Co., Ltd. Japan |
| Sinclair ZX Spectrum cass. | Kick Box Vigilante | 1991 | Zeppelin Games |
| Atari ST disk | Kick Off 2 | 1991 | Anco Soft., Ltd. |
| Atari ST disk | Kick Off 2 - Final Whistle | 1991 | Anco Soft., Ltd. |
| Commodore Amiga 500 disk | Kick Off 2 - Return to Europe | 1991 | Anco Soft., Ltd. |
| Commodore Amiga 500 disk | Kick Off 2 - The Final Whistle | 1991 | Anco Soft., Ltd. |
| Commodore Amiga 500 disk | Kick Off 2 - Winning Tactics | 1991 | Anco Soft., Ltd. |
| Atari ST disk | Kick Off 2 - Winning Tactics | 1991 | Anco Soft., Ltd. |
| Sinclair ZX Spectrum+3 disk | Kick-Box Vigilante Master Disk | 1991 | Zeppelin Games |
| Nintendo NES cart. | Kickle Cubicle | 1991 | Nintendo Co., Ltd. Japan |
| Commodore C64 disk | Kickout | 1991 | Markt & Technik |
| Nintendo Game Boy Cart. | Kid Icarus of Myths and Monsters Model DMG-KA-UKV | 1991 | Nintendo Co., Ltd. Japan |
| Nintendo Game Boy Cart. | Kid Icarus of Myths and Monsters Model DMG-KA-USA | 1991 | Nintendo of America, Inc. USA 45496 |
| Nintendo Super Famicom cart. | Kidou Senshi Gundam F91 - Formula Senki 0122 Model SHVC-GP | 1991 | Bandai Co., Ltd. Japan |
