| NEC PC-9801 Series 5.25in. disk |  Kindan no Ketsuzoku 18 | 1993 | C's Ware |
| NEC PC-9801 Series 5.25in. disk | Kindan no Paradise | 1989 | Zenryutsu Japan |
| NEC PC-9801 Series 5.25in. disk | King Flappy Model N04-G6110-P1 | 1985 | DB-SOFT Japan |
| NEC PC-9801 Series 5.25in. disk | King's Bounty - Nusumareta Chitsujo | 1994 | Starcraft, Inc. Japan |
| NEC PC-9801 Series 5.25in. disk | King's Dungeon - The Story of Heroes | 1992 | Soft Plan Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | King's Quest V - Absence Makes the Heart Go Yonder | 1991 | Sierra On-Line, Inc. USA 20626 |
| NEC PC-9801 Series 5.25in. disk | Kirakira Megami Sensei! | 1993 | Birdy Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Kirishima Shinryoushitsu no Gogo 18 | 1995 | May-Be Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Kisou Shinden Gen-Kaiser | 1995 | TGL Technical Group Laboratory Japan |
| NEC PC-9801 Series 5.25in. disk | Kiss 18 | 1992 | Ange Japan |
| NEC PC-9801 Series 5.25in. disk | Kiss of Murder - Satsui no Seppun | 1988 | Riverhill Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Kitahei | 1988 | SPS Japan |
| NEC PC-9801 Series 5.25in. disk | Kitoujima Joshi Keimusho | 1994 | Illusion Core Japan |
| NEC PC-9801 Series 5.25in. disk | Kiwame | 1992 | LOG Japan |
| NEC PC-9801 Series 5.25in. disk | Kiwame Daidougi | 1995 | Mainichi Communications |
| NEC PC-9801 Series 5.25in. disk | Kiwame II | 1993 | LOG Japan |
| NEC PC-9801 Series 5.25in. disk | Kizuato | 1996 | Leaf Japan |
| NEC PC-9801 Series 5.25in. disk | Klax Model MH-1643 | 1990 | Hudson Soft. Hudson Group Japan |
| NEC PC-9801 Series 5.25in. disk | Knights of the Sky Model MP40251030 | 1993 | MicroProse Japan K.K. |
| NEC PC-9801 Series 5.25in. disk | KO Seiki Beast Sanjuushi - Gaia no Fukkatsu | 1992 | Matrix Japan |
| NEC PC-9801 Series 5.25in. disk | KO Seiki Beast Sanjuushi - Rastak no Joou | 1993 | Matrix Japan |
| NEC PC-9801 Series 5.25in. disk | Kobe Renai Monogatari | 1990 | ZainSoft. Japan |
| NEC PC-9801 Series 5.25in. disk | Kobishoujo Noriko - Part I 18 | 1988 | System House Oh! Japan |
| NEC PC-9801 Series 5.25in. disk | Kohakuiro no Yuigon - Seiyou Karuta Renzoku Satsujin Jiken | 1988 | Riverhill Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Koihime Mystic Princess | 1995 | Silky's Japan |
| NEC PC-9801 Series 5.25in. disk | KOK Golf | 199? | Unknown Japan |
| NEC PC-9801 Series 5.25in. disk | Koko wa Rakuensou 18 | 1994 | Foster Japan |
| NEC PC-9801 Series 5.25in. disk | Koko wa Rakuensou 2 18 | 1995 | Foster Japan |
| NEC PC-9801 Series 5.25in. disk | Kokuritsu Kidou Sentai RIPS V | 1992 | Great Japan |
| NEC PC-9801 Series 5.25in. disk | Kon'yamo Asamade Powerful Mahjong 2 Model N04-G1120-P1 | 1988 | DB-SOFT Japan |
| NEC PC-9801 Series 5.25in. disk | Konpeki no Kantai | 1994 | Micro Cabin Co. Japan |
| NEC PC-9801 Series 5.25in. disk | Konpeki no Kantai 2 Perfect Model 55255 | 1995 | Micro Cabin Co. Japan |
| NEC PC-9801 Series 5.25in. disk | Koroshi no Dress 18 | 1987 | Fairytale Japan |
| NEC PC-9801 Series 5.25in. disk | Koroshi no Dress 2 18 | 1989 | Fairytale Japan |
| NEC PC-9801 Series 5.25in. disk | Koroshi no Dress 3 18 | 1992 | IDES Japan |
| NEC PC-9801 Series 5.25in. disk | Kotestu no Daibouken 18 | 1996 | T2 Japan |
| NEC PC-9801 Series 5.25in. disk | Kotohigaoka Monogatari 18 | 1995 | Miamisoft Japan |
| NEC PC-9801 Series 5.25in. disk | Kou to Ryuuhou 2 Model SF30111010 | 198? | Soft Plan Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Koukan Nikki 18 | 1994 | Fairy Dust Japan |
| NEC PC-9801 Series 5.25in. disk | Koukan Nikki Dai-II-Shou - Seiya o Anata to 18 | 1995 | Fairy Dust Japan |
