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- Marugame Castle, Marugame, Kagawa
- Maruoka Castle, Maruoka, Fukui
- Matsue Castle, Matsue, Shimane
- Matsukura Castle, Takayama, Gifu
- Matsumae Castle, Matsumae, Hokkaido
- Matsumori Castle, Izumi, Miyagi
- Matsumoto Castle, Matsumoto, Nagano
- Matsushiro Castle, Nagano, Nagano
- Matsuyama Castle, Matsuyama, Ehime
- Matsuyama Castle, Takahashi, Okayama
- Matsuzaka Castle, Matsusaka, Mie
- Mihara Castle Mihara, Hiroshima
- Minakuchi Castle, Kōka, Shiga
- Minato Castle, Akita, Akita
- Minowa Castle, Takasaki, Gunma
- Mito Castle, Mito, Ibaraki
- Mitsumine Castle, Sabae, Fukui
- Miyao Castle site, Miyajima, Hiroshima
- Mizusawa Castle, Oshu, Iwate
- Momoyama Castle, see Fushimi Castle
- Morioka Castle (Kozukata Castle), Morioka, Iwate
- Motegi Castle, Motegi, Tochigi
- Muro Castle, Toyohashi, Aichi
Read more about this topic: List Of Castles In Japan