| Pachislot |  Hanabi Hyakkei | 2003 | Eleco, Ltd. Aruze Group Japan |
| Pachislot | Haou Nobunaga | 2003 | Luster Co., Ltd. Japan |
| Sega Dreamcast GD | Happy Breeding Model T-46512M | 2003 | Princess Soft |
| Redemption mechanical game | Happy Gyro | 2003 | Amuse World Corp. Seoul, Korea |
| Kiddie Ride | Happy Jeep | 2003 | Subsino Co., Ltd. |
| Medal video game | Happy Spin II Deluxe | 2003 | Andamiro Co., Ltd. |
| PC/MS-Windows CD | Harbinger | 2003 | DreamCatcher Interactive |
| Tomy Evio cart. | Hard Soul 1 Model eM8 | 2003 | Tomy |
| PC/MS-Windows CD | Harry Potter - Quidditch World Cup | 2003 | EA Games Electronic Arts, Inc. |
| Nintendo GBA cart. | Harry Potter - Quidditch World Cup Model AGB-BHPE-USA | 2003 | EA Games Electronic Arts, Inc. |
| Nintendo GBA cart. |  Harry Potter - Quidditch World Cup Model AGB-BHPJ-JPN | 2003 | EA Games Electronic Arts, Inc. |
| Nintendo GBA cart. | Harry Potter - Quidditch World Cup Model AGB-BHPP | 2003 | EA Games Electronic Arts, Inc. |
| Nintendo GameCube disc | Harry Potter - Quidditch World Cup Model DOL-GQWE-USA | 2003 | Electronic Arts CA, USA 14633 |
| Nintendo GameCube disc | Harry Potter - Quidditch World Cup Model DOL-GQWP-EUR | 2003 | Electronic Arts CA, USA 14633 |
| Nintendo Game Boy Color cart. | Harry Potter 3 2003 | 2003 | Unknown China |
| Nintendo GameCube disc | Harry Potter and the Sorcerer's Stone | 2003 | Electronic Arts CA, USA 14633 |
| Nintendo GameCube disc | Harry Potter World Cup | 2003 | Electronic Arts CA, USA 14633 |
| Sony PlayStation CD | Harukanaru Toki no Naka de - Banjou Yuugi Model SLPM 87241 | 2003 | KOEI Co., Ltd. Japan |
| Sony PlayStation CD | Harukanaru Toki no Naka de - Banjou Yuugi Model SLPM-87242 | 2003 | KOEI Co., Ltd. Japan |
| Nintendo GBA cart. | Harvest Moon - Friends of Mineral Town Model AGB-A4NP | 2003 | Ubisoft Ent. Montreuil sous Bois, France |
| Nintendo GBA cart. | Harvest Moon - Friends of Mineral Town Model AGB-AN5E-USA | 2003 | Natsume, Inc. Japan |
| Slot Machine | Haul 'n Cash | 2003 | IGT International Game Technologies Reno, NV, USA |
| Slot Machine | Hawaiian Dream | 2003 | Konami Gaming, Inc. Las Vegas, NV, USA |
| Tomy Evio cart. | Healing Air 1 Model eM5 | 2003 | Tomy |
| PC/MS-Windows CD | Heaven & Hell | 2003 | CDV Soft. Ent. USA, Inc. |
| Sinclair ZX Spectrum cass. | Hedda Strikes Again | 2003 | Adventure Probe Soft. |
| Pachinko | Heian Kenbunroku | 2003 | Newgin Japan |
| Sony PlayStation CD | Herkules Model SLES-04124 | 2003 | Phoenix Games |
| PC/MS-Windows CD | Heroes of Might and Magic IV - Winds of War | 2003 | 3DO Co., The CA, USA |
| Slot Machine | Heros | 2003 | Bally Wulff |
| Medal video game | Hexagon | 2003 | Andamiro Co., Ltd. |
| Arcade Video game | Hi Pai Paradise | 2003 | Aruze Corp. Japan |
| PC/MS-Windows CD | Hidden & Dangerous 2 | 2003 | Gathering of Developers, Inc. |
| Arcade Video game | Hidden Catch Movie - Wonderful Days | 2003 | Eolith Co., Ltd. |
| Slot Machine | Hidden Gold | 2003 | WMS Gaming, Inc. Chicago, IL, USA |
| Video Slot Machine | High Claudius | 2003 | Vivid Gaming England |
| Pachinko | High School! Kimengumi Model G | 2003 | Maruhon Japan |
| PC/MS-Windows CD | Highland Warriors | 2003 | Data Becker GmbH Germany |
| PC/MS-Windows CD | Higurashi no Naku Koro ni - Tatarigoroshi-hen | 2003 | 07th Expansion |
| Pachislot | Hinokuni 25-Pai | 2003 | Aristocrat Technologies Co., Ltd. Tokyo, Japan |
