Music Publisher / Manufacturer
- Kinema Junpo sha
- King Records
- King Records
- Kinokuniya Shoten
- Kitty
- KKベストセラーズ
- KMP
- Knockers Records
- Knowledge Alliance
- KNTV株式会社
- Kobunsha
- Kodansha
- koei
- Konami Music Entertainment
- Korea Entertainment Journal
- Kosaido Publishing
- Kosaido-Akatsuki
- Kosaido-Akatsuki
- Kotobukiya
- KPR
- KTC中央出版
- KT企画
- Kyuryudo
- L&K inc.
- Lantis
- lastrum
- Lastrum Corporation
- LASTRUM distribution
- LD&K inc.
- LDH
- Leap Records
- Lexington
- LEXINGTON Co.,Ltd
- Like an Edison Distribution
- Line Communications
- LISTEN FLAVOR
- Littlemore
- Liverpool
- Loft Records
- M & Y Records
- M&I Company
- M&S
- M.crew
- MA MUSIC ENTERTAINMENT
- Mag Garden
- Magazine House
- MAGES.
- Mainichishimbun Shuppan
- Maker Original
- MariBooks
- Marine Entertainment
- Marquee Inc.
- Marvelous
- Marvelous Entertainment Inc.
- Max Factory
- Max Limited
- Maxam
- MaxCORP
- Maxell E Cube
- MCA Victor
- Media Factory
- Media Factory
- Media Remoras
- Media Ring
- Media Station
- MEDICOM-TOY
- MEDICOS ENTERTAINMENT
- Megahouse
- melody
- melting bot、Inpartmaint
- MEM
- MENTOR
- Mercury Music Entertainment
- Micro Force
- MICROMAGAZINE Inc.
- Midi
- Midi:Nette
- Milestone
- mille books
- MIS
- MIyazawamokei
- MME
- Moi-meme-Moitie
- monochro records
- Monsoon Records
- Monster Life
- Mother & Children
- Movic
- Movin On
- Moving On
- MSI
- Muse Entertainment
- Music Magazine
- Music Magazine
- Music Mine
- MusicGate com
- My Navi Shuppan
- My Navy
- NAGAOKA
- Navee Records