| NEC PC-9801 Series 5.25in. disk |  Jangou 4 | 1994 | Victor Ent. Japan |
| NEC PC-9801 Series 5.25in. disk | JanKen | 199? | Unknown Japan |
| NEC PC-9801 Series 5.25in. disk | Jankenpon | 199? | CMS Planning |
| NEC PC-9801 Series 5.25in. disk | Jankirou 18 | 1994 | IDES Japan |
| NEC PC-9801 Series 5.25in. disk | Janou Touryuumon | 1991 | Game Arts Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Janou Touryuumon II | 1991 | Game Arts Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Japan Bashing | 1992 | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Japanese Cult Quiz Zipang | 1993 | Wild Life Japan |
| NEC PC-9801 Series 5.25in. disk | Jealousy | 1995 | Inter Heart Japan |
| NEC PC-9801 Series 5.25in. disk | Jedai | 1994 | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Jelda II Model GA-032 | 1984 | Carry Lab. Japan |
| NEC PC-9801 Series 5.25in. disk | Jelda Model PP-28 | 1983 | Carry Lab. Japan |
| NEC PC-9801 Series 5.25in. disk | Jelda Model PP-35 | 1983 | Carry Lab. Japan |
| NEC PC-9801 Series 5.25in. disk | Jesus II Model E-G259 | 1991 | Enix, Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Jet - F-16/F-18 Combat Simulator | 1989 | SubLOGIC Corp. Champaign, IL, USA |
| NEC PC-9801 Series 5.25in. disk | Jet Kun | 199? | Unknown Japan |
| NEC PC-9801 Series 5.25in. disk | Jikuu no Hanayome | 1989 | Kogado Studio Japan |
| NEC PC-9801 Series 5.25in. disk | Jikuu Sousakan Pretty Angel - Misty Flash | 1994 | Peppermint Kids Japan |
| NEC PC-9801 Series 5.25in. disk | Jinmon Yuugi 18 | 1995 | IDES Japan |
| NEC PC-9801 Series 5.25in. disk | Jinn - Eternal Hero | 1994 | Tenshindo |
| NEC PC-9801 Series 5.25in. disk | Jinsei Quiz Game Da | 1992 | Ucom Japan |
| NEC PC-9801 Series 5.25in. disk | Jissen Billiards Model PS-24 | 1989 | Pack-In-Video Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Joker | 1991 | Birdy Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Joker II | 1992 | Birdy Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Jonason - Kairai no Mai | 1994 | XYZ Japan |
| NEC PC-9801 Series 5.25in. disk | Jong Kyou Model YF-1001 | 198? | Hudson Soft. Hudson Group Japan |
| NEC PC-9801 Series 5.25in. disk | Joro v2 | 199? | Unknown Japan |
| NEC PC-9801 Series 5.25in. disk | Jorou Gumo - Jubaku no Mesu Dorei-tachi 18 | 1997 | PIL Japan |
| NEC PC-9801 Series 5.25in. disk | Josei Shain o Ikasu Hou | 1988 | Champion Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Joshidai-sei Private Model NFNW11001 | 1984 | Falcom Japan |
| NEC PC-9801 Series 5.25in. disk | Joshikou Seifuku Monogatari 18 | 1994 | KSS Media Ent. Co. Japan |
| NEC PC-9801 Series 5.25in. disk | Joshua | 1992 | Panther Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Jotunn | 1988 | Xain Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Jump Hero | 1994 | Compile |
| NEC PC-9801 Series 5.25in. disk | Junk Jankey's 2 | 199? | Unknown Japan |
| NEC PC-9801 Series 5.25in. disk | JYB | 1993 | Cocktail Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Kaerimichi wa Kiken ga Ippai 18 | 1990 | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Kagayake! Kirakira Senshi Risky Jewel | 1994 | Natsume, Inc. Japan |
| NEC PC-9801 Series 5.25in. disk | Kagerou Meikyuu | 1990 | Heart Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Kagi Ana Satsujin Jiken - Keyhole Murder Model NFTQ11001 | 1983 | Thinking Rabbit Japan |
