| Sony PlayStation CD |  Knockout Kings 99 Model SLES-01448 | 1998 | EA Sports |
| Sony PlayStation CD | Knockout Kings 99 Model SLES-01450 | 1998 | EA Sports |
| Sony PlayStation CD |  Knockout Kings Model SLUS-00737 | 1998 | EA Sports |
| Sharp X68000 Series 5.25in. disk | Ko Net Joker Developer Release | 1998 | Toyoshima |
| Sharp X68000 Series 5.25in. disk | Ko Net Joker Developer Release 2 | 1998 | Toyoshima |
| Nintendo 64 cart. | Kobe Bryant in NBA Courtside | 1998 | Nintendo Co., Ltd. Japan |
| Sega Saturn CD | Kochira Katsushikaku Kameari Kouenmae Hashutsujo Nakagawa Land Dai Race! no Maki Model T-13332G | 1998 | Bandai Co., Ltd. Japan |
| Sega Saturn CD | Koden Koureijjyutsu Hyaku Monogatari - Hontoni Atta Kowai Hanashi Satakore | 1998 | Hudson Soft. Hudson Group Japan |
| Sega Saturn CD |  Koei Best Collection: Taikou Risshiden II Model T-7667G | 1998 | KOEI Co., Ltd. Japan |
| Sony PlayStation CD | Koei Teiban: Nobunaga no Yabou - Returns Model SLPM-86169 | 1998 | KOEI Co., Ltd. Japan |
| Sony PlayStation CD | Koei the Best: Nanatsu no Hikan Model SLPM-86179~81 | 1998 | KOEI Co., Ltd. Japan |
| Sony PlayStation CD | Koguma-chan no Daibouken Model SLPM-80195 | 1998 | Sunmark Japan |
| Sony PlayStation CD | Kojin Kyouju - La Lecon Particuliere Model SLPS-01354 | 1998 | MYCOM Japan |
| MSX 2 disk | Kokuhaku - Declare | 1998 | Unknown Japan |
| Konami System 573 disc+cart. | Konami 80's Arcade Gallery Model GC826 | 1998 | Konami Co., Ltd. Japan |
| Konami System 573 disc+cart. | Konami 80s AC Special Model GC826 | 1998 | Konami Co., Ltd. Japan |
| Sega Saturn CD | Konami Antiques MSX Collection Ultrapack Model T-9530G | 1998 | Konami Co., Ltd. Japan |
| Sony PlayStation CD | Konami Antiques MSX Collection Vol.2 Model SLPM-86062 | 1998 | Konami Co., Ltd. Japan |
| Sony PlayStation CD | Konami Antiques MSX Collection Vol.3 Model SLPM-86072 | 1998 | Konami Co., Ltd. Japan |
| Nintendo Game Boy Cart. | Konami GB Collection Vol.3 Model DMG-AJKJ-JPN | 1998 | Konami Co., Ltd. Japan |
| Nintendo Game Boy Cart. | Konami GB Collection Vol.4 Model DMG-AJLJ-JPN | 1998 | Konami Co., Ltd. Japan |
| Nintendo Game Boy Cart. | Konchuu Hakase Model DMG-AKJJ-JPN | 1998 | J-Wing |
| Video Slot Machine | Kooka Bucks | 1998 | Aristocrat Leisure Industries Pty, Ltd. |
| Arcade Video game | Kosodate Quiz My Angel 3 | 1998 | NAMCO, Ltd. Japan |
| Sega Saturn CD | Koudou Saisoku Densetsu - Kashiramoji D - Initial D | 1998 | ASK Kodansha Co., Ltd. Japan |
| Nintendo Game Boy Cart. | Koukiatsu Boy Model DMG-AKEJ-JPN | 1998 | Konami Co., Ltd. Japan |
| Sony PlayStation CD | Kouryuuki Model SLPS-01338 | 1998 | KOEI Co., Ltd. Japan |
| PC/MS-Windows CD | Kreuz und Quer | 1998 | Lidos |
| Sony PlayStation CD | Kula World Model SCES-01000 | 1998 | Sony Computer Ent. Europe SCEE |
| Sony PlayStation CD |  KulaQuest Taikenban Model PCPX-96121 | 1998 | Sony Computer Ent., Inc. SCEI Japan |
| Sega Pico game | Kuma no Pooh-san - Christopher Robin wo Sagase Model T-255040 | 1998 | Kodansha Japan |
| Sony PlayStation CD | Kumitate Battle - Kuttu Ketto Model SLPS-01208 | 1998 | Tecno Soft. TechnoSoft Japan |
| Sega Saturn CD | Kumitate Battle - Kuttu Ketto Model T-1813G | 1998 | Tecno Soft. TechnoSoft Japan |
| Sega Saturn CD | Kunoichi Torimonochou Model T-6803G | 1998 | CRI CSK Research Institute Japan |
| Sony PlayStation CD | Kuon no Kizuna Model SLPS-01676 | 1998 | FOG Full On Games Japan |
| Sony PlayStation CD | Kurashi Iki! Iki! PlayStation Welcome Disc Model PAPX-90045 | 1998 | Sony Computer Ent., Inc. SCEI Japan |
| Sony PlayStation CD | L'Invasion Vient de l'Espace Model SLES-01573 | 1998 | GT Interactive Soft. Corp. NY, USA |
| Arcade Video game | L.A.Machineguns - Rage of the Machines | 1998 | SEGA Enterprises, Ltd. Tokyo, Japan |
| PC/MS-Windows CD | Laburinthos | 1998 | Samsung Korea |
| Sony PlayStation CD | Lake Masters 2 - Bass Fishing in Japan Model SLPS-01342 | 1998 | DaZZ Japan |
