| Nintendo Super Famicom cart. |  JRA PAT - Wide Taiyouban Model SHVC-TJEJ-JPN | 1999 | NTT Data Japan |
| Sony PlayStation CD |  Juggernaut Model SLUS-00894/00988-89 | 1999 | JALECO USA, Inc. USA |
| Pachislot | Juggler V | 1999 | Kitac Kita Denshi Corp. Japan |
| Arcade Video game | Jump Jump | 1999 | Comad Industry Co., Ltd. Korea |
| Arcade Video game | Jumping Break | 1999 | F2 System Seoul, Korea |
| Coin-op Misc. game | Jumping Groove | 1999 | NAMCO, Ltd. Japan |
| Arcade Video game | Jungle | 1999 | Yonshi |
| Pachinko | Jungle Park S1 | 1999 | Kyoraku Sangyo Japan |
| Pachinko | Jungle Park V2 | 1999 | Kyoraku Sangyo Japan |
| Sony PlayStation CD | Junjou de Karen - Meymay Kishidan - Spectral Force Seishoujo Gaiden Model SLPS-02431 | 1999 | Idea Factory Co., Ltd. Japan |
| Sony PlayStation CD | Junk Brain Diagnosis - Kanako Enomoto Model SLPS-01937 | 1999 | Oracion, Inc. Japan |
| Pachislot | Jurokichi | 1999 | Aruze Corp. Japan |
| Nintendo Game Boy Color cart. | Juukou Senki Bullet Battlers Model DMG-AZXJ-JPN | 1999 | Konami Co., Ltd. Japan |
| Sony PlayStation CD | Juusou Kihei Valken 2 Model SLPS-00854 | 1999 | Masaya |
| Sony PlayStation CD | K-1 Revenge Model SLUS-00766 | 1999 | JALECO USA, Inc. USA |
| PC/MS-Windows CD | K.O. | 1999 | Data Becker GmbH Germany |
| PC/MS-Windows CD | K.O.I.H.I.M.E | 1999 | Elf Japan |
| Pachislot | Kabuki | 1999 | Sammy Corp. Japan |
| Sony PlayStation CD |  Kaeru no Ehon - Nakushita Kioku o Motomete Taikenban Model SLPM-80460 | 1999 | Victor Interactive Soft., Inc. |
| Sony PlayStation CD | Kaeru no Ehon - Nakushita Kioku o Motomete Model SLPS-02332 | 1999 | Victor Interactive Soft., Inc. |
| Sony PlayStation CD | Kagayaku Kisetsu e Model SLPS-01972~3 | 1999 | KID Kindle Imagine Develop |
| Sony PlayStation CD | Kagayaku Kisetsu e Model SLPS-01975 | 1999 | KID Kindle Imagine Develop |
| Sony PlayStation CD | Kagero - Deception II Model SLES-01967 | 1999 | Virgin Interactive Ent., Ltd. UK 013715 |
| Arcade Video game | Kaisen Channel Mars TV | 1999 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sony PlayStation CD | Kaitoh Ranma Miyabi Model SLPS-01824 | 1999 | Imagineer Co., Ltd. Japan |
| Sony PlayStation CD | Kaitoh Ranma Miyabi Model SLPS-01825 | 1999 | Imagineer Co., Ltd. Japan |
| Arcade Video game | Kaiun Quiz | 1999 | NAMCO, Ltd. Japan |
| Nintendo 64 cart. | Kakutou Denshou - F-Cup Maniax Model NUS-NFYJ | 1999 | Imagineer Co., Ltd. Japan |
| Nintendo Game Boy Color cart. | Kakutou Ryouri Densetsu Bistro Recipe - Gekitou Foodon Battle-Hen Model DMG-AWRJ-JPN | 1999 | Banpresto Japan |
| Nintendo Game Boy Color cart. | Kakutou Ryouri Densetsu Bistro Recipe - Kettou Bistgarm-Hen Model DMG-A2WJ-JPN | 1999 | Banpresto Japan |
| Bandai WonderSwan cart. | Kakutou Ryouri Densetsu Bistro Recipe - Wonder Battle-Hen Model SWJ-BPR002 | 1999 | Banpresto Japan |
| PC/MS-Windows CD | Kamui | 1999 | Himeya Soft., Inc. Japan |
| PC/MS-Windows CD | Kana - Little Sister | 1999 | DO Corp. Japan |
| PC/MS-Windows CD | Kanaan | 1999 | UBI Soft Creteil, France 307211 |
| Sony PlayStation CD | Kanazawa Shougi - Tsuki Model SLPS-02059 | 1999 | Seta Co., Ltd. Japan |
| Nintendo Game Boy Color cart. | Kanji Boy Model DMG-AWKJ-JPN | 1999 | J-Wing |
| Nintendo Game Boy Color cart. | Kanzume Monsters Parfait Model DMG-AQPJ-JPN | 1999 | Starfish, Inc. Japan |
| Pachislot | Kappa No Yu Seven | 1999 | Yamasa Japan |
| Nintendo Game Boy Color cart. | Kaseki Sousei Reborn II - Monster Digger Model DMG-ARMJ-JPN | 1999 | Starfish, Inc. Japan |
| Sony PlayStation CD | Katou Hifumi Ku-dan - Shougi Club Model SLPS-02078 | 1999 | HECT Hector Japan |
