| Slot Machine |  Jockey Star III | 2003 | Unknown Korea |
| Slot Machine | Jockey Star IV | 2003 | Unknown Korea |
| Slot Machine | Jockey Star VI | 2003 | Unknown Korea |
| PC/MS-Windows CD | Joi O Kkusu | 2003 | Blue Gale |
| PC/MS-Windows CD | Jojiyoi Okusu | 2003 | Blue Gale |
| Slot Machine | Joker 21 | 2003 | San Remo Games srl San Remo, IM, Italy |
| Medal video game | Joker Ccamdo | 2003 | Unknown Korea |
| Medal video game | Joker Club | 2003 | Unknown Korea |
| Slot Machine | Joker Fever - Dragon Deal Model RVN-BLX | 2003 | Dragon Co., Ltd. |
| Slot Machine | Joker Magic | 2003 | Sammy Corp. Japan |
| Kiddie Ride | Joy Jumbo | 2003 | Subsino Co., Ltd. |
| Slot Machine | Joy Pet | 2003 | Subsino Co., Ltd. |
| Nintendo GameCube disc | Judge Dredd - Dredd vs Death Model DOL-GJDX-EUR | 2003 | Sierra Ent., Inc. USA |
| Sony PlayStation 2 disc |  Judie no Atelier - Gramnad no Renkinjutsushi Model SLPM-65359 | 2003 | Gust Japan |
| Pachislot | Juggler Girl | 2003 | Kitac Kita Denshi Corp. Japan |
| Pachislot | Julian | 2003 | Net Corp. Japan |
| Slot Machine | Jumpin' Jack | 2003 | Bally Wulff |
| Fruit Machine | Jumpin' Jokers | 2003 | Vivid Gaming England |
| Slot Machine | Jungle | 2003 | Subsino Co., Ltd. |
| Redemption mechanical game | Jungle Treasures | 2003 | SEGA Amusements, Inc. Elk Grove Village, IL, USA |
| PC/MS-Windows CD | Jurassic Park - Operation Genesis | 2003 | Vivendi Universal Games, Inc. |
| Nintendo GBA cart. | Jurassic Park Institute Tour - Dinosaur Rescue Model AGB-AJ8J-JPN | 2003 | Rocket Co. Japan |
| Nintendo GBA cart. | Justice League Chronicles Model AGB-BJLE-USA | 2003 | Midway Home Ent. |
| Medal video game | K2+ | 2003 | Unknown Korea |
| Slot Machine | Kaboom | 2003 | WMS Gaming, Inc. Chicago, IL, USA |
| Sony PlayStation CD | Kaitou Apricot Model SLPS-03532 | 2003 | Takuyo Co., Ltd. |
| Sega Dreamcast GD | Kaitou Apricot Model T-37910M | 2003 | Takuyo Co., Ltd. |
| Pachislot | Kaizoku Gappo | 2003 | Eipex Tokyo, Japan |
| Slot Machine | Kaleidoscope | 2003 | WMS Gaming, Inc. Chicago, IL, USA |
| Sega Pico game | Kamen Rider 555 Model T-1334505 | 2003 | Bandai Co., Ltd. Japan |
| Nintendo Game Boy Color cart. | Kanji Boy 3 Model CGB-BK3J-JPN | 2003 | J-Wing |
| IVL Easy Karaoke cart. | KaraokeMicro Star Cart. 1 | 2003 | IVL Technologies |
| IVL Easy Karaoke cart. | KaraokeMicro Star Cart. 2 | 2003 | IVL Technologies |
| Nintendo GBA cart. | Kawaii Pet Game Gallery Model AGB-BKGJ-JPN | 2003 | Culture Brain |
| Pachislot | Kaze no Youjimbou | 2003 | Rodeo Corp. Japan |
| Medal video game | KBH 3 | 2003 | Union Bird Korea |
| Slot Machine | Kenosaurus Keno | 2003 | IGT International Game Technologies Reno, NV, USA |
| Dedicated Console | Kenshin Dragon Quest - Yomigaerishi Densetsu no Ken | 2003 | Square Enix Co., Ltd. Japan |
| Pachinko | Kerokero Keroppi | 2003 | Ginza Japan |
| Nintendo GameCube disc | Kerokero King DX | 2003 | Bandai Co., Ltd. Japan |
