| Nintendo Famicom cart. |  Kaiketsu Yanchamaru 3 - Taiketsu! Zouringen Model IF-28 | 1993 | Irem Corp. Japan |
| Nintendo Famicom cart. | Kaiketsu Yanchamaru Model IF-07 | 1987 | Irem Corp. Japan |
| Nintendo Famicom cart. | Kakefu-kun no Jump Tengoku - Speed Jigoku Model VIC-KX | 1988 | Vic Tokai Japan |
| Nintendo Famicom cart. | Kame no Ongaeshi - Urashima Densetsu Model HFC-KO | 1988 | Hudson Soft. Hudson Group Japan |
| Nintendo Famicom cart. | Kamen no Ninja - Akakage Model TDF-AK | 1988 | Toei Animation Co., Ltd. Japan |
| Nintendo Famicom cart. | Kamen no Ninja - Hanamaru Model CAP-JE | 1990 | Capcom Co., Ltd. Japan |
| Nintendo Famicom cart. | Kamen Rider Club - Gekitotsu Shocker Land Model BA-KAMEN | 1988 | Bandai Co., Ltd. Japan |
| Nintendo Famicom cart. | Kamen Rider SD - GranShocker no Yabou Model ANG-KA | 1993 | Angel Japan |
| Nintendo Famicom cart. | Kang Ti Wu Wang | 2001 | FengLi China |
| Nintendo Famicom cart. | Kanshaku Tamanage Kantarou no Toukaidou Gojuusan Tsugi Model SS5-4900 | 1986 | SUNSOFT Kounan, Japan |
| Nintendo Famicom cart. | Karakuri Kengouden Musashi Road - Karakuribito Hashiru! Model SHI-98 | 1991 | Yutaka |
| Nintendo Famicom cart. | Karaoke Studio Model BA-KARAOKE | 1987 | Bandai Co., Ltd. Japan |
| Nintendo Famicom cart. | Karateka Model SFC-KR P | 1985 | Soft Pro International Japan |
| Nintendo Famicom cart. | Karnov Model NAM-KA-4900 | 1987 | NAMCOT Japan |
| Nintendo Famicom cart. | Kawa no Nushi Tsuri Model PAC-7K | 1990 | Pack-In-Video Co., Ltd. Japan |
| Nintendo Famicom cart. | Keiba Simulation - Honmei Model NBF-KH | 1989 | Nichibutsu Nihon Bussan Co., Ltd. Osaka, Japan |
| Nintendo Famicom cart. | Kekkyoku Nankyoku Daibouken Model RC804 | 1985 | Konami Industry Co., Ltd. Japan |
| Nintendo Famicom cart. | Kero Kero Keroppi no Daibouken 2 - Donuts Ike Wa Oosawagi! Model CTS-KK | 1993 | Character Soft |
| Nintendo Famicom cart. | Kero Kero Keroppi no Daibouken Model CTS-ZI | 1991 | Character Soft |
| Nintendo Famicom cart. | Keroppi to Keroriinu no Splash Bomb! Model CTS-SY | 1993 | Character Soft |
| Nintendo Famicom cart. | Ki no Bouken - The Quest of Ki Model NAM-QK-3900 | 1988 | NAMCOT Japan |
| Nintendo Famicom cart. | Kidou Senshi Z Gundam - Hot Scramble Final version | 1986 | Bandai Co., Ltd. Japan |
| Nintendo Famicom cart. | Kidou Senshi Z Gundam - Hot Scramble Model BA-ZG | 1986 | Bandai Co., Ltd. Japan |
| Nintendo Famicom cart. | King Kong 2 - Ikari no Megaton Punch Model RC816 | 1986 | Konami Industry Co., Ltd. Japan |
| Nintendo Famicom cart. | King of Kings Model NAM-KK-5900 | 1988 | NAMCOT Japan |
| Nintendo Famicom cart. | King' Knight Model SQF-KG | 1986 | Square Co., Ltd. Japan |
| Nintendo Famicom cart. | Kinnikuman - MUSCLE Tag Match Model BA-KIN | 1985 | Bandai Co., Ltd. Japan |
| Nintendo Famicom cart. | Kira Kira Star Night Model CBS-KS Hb | 2016 | Columbus Circle Japan |
| Nintendo Famicom cart. | Kiteretsu Daihyakka Model EPO-KT | 1990 | Epoch Co., Ltd. Tokyo, Japan |
| Nintendo Famicom cart. | KKachi-wa Norae Chingu | 1994 | HiCom Korea |
| Nintendo Famicom cart. |  Klax Model HFC-V6 | 1990 | Hudson Soft. Hudson Group Japan |
| Nintendo Famicom cart. | Knight Rider Model PAC-NR | 1988 | Pack-In-Video Co., Ltd. Japan |
| Nintendo Famicom cart. | Koko Adventure Model DS-F301 | 1993 | Daou Infosys Korea |
| Nintendo Famicom cart. | Kola OK | 19?? | Unknown |
| Nintendo Famicom cart. | Konami Wai Wai World Model RC825 | 1988 | Konami Industry Co., Ltd. Japan |
| Nintendo Famicom cart. | Konamic Sports in Seoul Model KDS-F2 | 1989 | Konami Industry Co., Ltd. Japan |
| Nintendo Famicom cart. | Kou Dai Bao Shi - Hong Model NJ002 | 200? | Shenzhen Nanjing Technology Co., Ltd. China |
| Nintendo Famicom cart. | Kou Dai Bao Shi - Jin Model NJ003 | 200? | Shenzhen Nanjing Technology Co., Ltd. China |
| Nintendo Famicom cart. | Kou Dai Bao Shi - Lan Model NJ001 | 200? | Shenzhen Nanjing Technology Co., Ltd. China |
| Nintendo Famicom cart. | Kou Dai Bao Shi - Yin Model NJ004 | 200? | Shenzhen Nanjing Technology Co., Ltd. China |
