| Arcade Video game |  Gekitou Pro Yakyuu - Mizushima Shinji All Stars vs. Pro Yakyuu GDT-0008C | 2003 | SEGA Corp. |
| Nintendo GBA cart. | Gem Smashers Model AGB-AZSE-USA | 2003 | Metro 3D, Inc. |
| Pachinko | Genjino | 2003 | Sammy Corp. Japan |
| Nintendo GBA cart. | Gensou Maden Saiyuuki - Hangyaku no Toushin-taishi Model AGB-BGMJ-JPN | 2003 | Digital Kids |
| LeapFrog Leapster cart. | Get Puzzled! | 2003 | LeapFrog |
| Nintendo GBA cart. | Get! Boku no Mushi Tsukamaete Model AGB-BGBJ-JPN | 2003 | Kemco, Ltd. |
| Nintendo GBA cart. | GetBackers Dakkanya - Jagan Fuuin! Model AGB-BGFJ-JPN | 2003 | Konami Corp. Japan |
| Nintendo GBA cart. | GetBackers Dakkanya - Metropolis Dakkan Sakusen! Model AGB-A8GJ-JPN | 2003 | Konami Corp. Japan |
| Slot Machine | Ghastly Gold | 2003 | Konami Gaming, Inc. Las Vegas, NV, USA |
| PC/MS-Windows CD | Ghost Master | 2003 | Empire Interactive Europe, Ltd. |
| Slot Machine | Ghost Winners | 2003 | IGT International Game Technologies Reno, NV, USA |
| Medal video game | GI-Turf Wild | 2003 | Konami Corp. Japan |
| Pachinko | Giant Baba no CR Appoo | 2003 | Takao Co., Ltd. Japan |
| Nintendo GameCube disc | Giant Egg - Billy Hatcher no Daibouken | 2003 | SEGA Corp. |
| Nintendo GameCube disc | Giftpia Model DOL-GGFJ-JPN | 2003 | Nintendo Co., Ltd. Japan |
| Pachislot | Giga Fever | 2003 | Daido |
| Medal video game | Git Go Tango | 2003 | SunA Electronics Ind. Co., Ltd. |
| PC/MS-Windows CD | Gladiator - Sword Of Vengeance | 2003 | Acclaim Ent., Inc. Glen Cove, NY, USA |
| Nintendo GameCube disc | Gladius | 2003 | LucasArts Ent. Co. |
| Sinclair ZX Spectrum cass. | Gloop Hb | 2003 | Cronosoft |
| GamePark GP32 cart. | GlooP Deluxe | 2003 | Aeon Flame |
| Slot Machine | Gloria SL | 2003 | Bally Wulff |
| Slot Machine | Go for It | 2003 | WMS Gaming, Inc. Chicago, IL, USA |
| Redemption mechanical game | Go Go Cowboy | 2003 | Sammy Corp. Japan |
| Redemption mechanical game | Go Round | 2003 | Unknown Japan |
| Nintendo GameCube disc | Go! Go! Hypergrind Model DOL-GHGE-USA | 2003 | Atlus USA, Inc. CA, USA |
| Nintendo GameCube disc | Goblin Commander - Unleash the Horde Model DOL-GGCE-USA | 2003 | JALECO Ent. Previously JALECO USA |
| PC/MS-Windows CD | Gods and Generals | 2003 | Activision Publishing, Inc. Los Angeles, CA, USA 47875 |
| Pachinko | Godzilla | 2003 | Newgin Japan |
| Nintendo GBA cart. | Godzilla - Kaijuu Dairantou Advance Model AGB-AG4J-JPN | 2003 | Atari Interactive, Inc. |
| Slot Machine | Going For Fours Poker | 2003 | IGT International Game Technologies Reno, NV, USA |
| Medal video game | Gold Bar | 2003 | Unknown Korea |
| Slot Machine | Gold Cherry Model RR9-WH-001 | 2003 | Dragon Co., Ltd. |
| Slot Machine | Gold Fish | 2003 | WMS Gaming, Inc. Chicago, IL, USA |
| Medal video game | Gold Happy Change | 2003 | Unknown Korea |
| Medal video game | Gold Hunt | 2003 | Unknown Korea |
| Slot Machine | Gold Mine A | 2003 | Unknown Korea |
| Slot Machine | Gold of Roma Classic Blend Series | 2003 | EGT Euro Games Technology, Ltd. Bulgaria |
| Medal video game | Gold Rally 2 | 2003 | Unknown Korea |
| Medal video game | Gold Seven | 2003 | FGT, Inc. Korea |
