N
- Nagahama Castle, Nagahama, Shiga
- Nagamori Castle, Gifu, Gifu Prefecture
- Nagaoka Castle, Nagaoka, Niigata
- Nagashino Castle, Shinshiro, Aichi
- Nagoya Castle, Nagoya, Aichi
- Nagoya Castle, Karatsu, Saga
- Nagurumi Castle, Minakami, Gunma
- Nakagusuku Castle, Nakagusuku, Okinawa Prefecture
- Nakatsu Castle, Nakatsu, Ōita
- Nakijin Castle, Nakijin, Motobu Peninsula, Okinawa Prefecture
- Nanao Castle, Nanao, Ishikawa
- Ne Castle, Hachinohe, Aomori
- Negoya Castle, Otaki, Chiba
- Nihonmatsu Castle, Nihonmatsu, Fukushima
- Nijō Castle, Kyoto, World Heritage Site
- Nirayama Castle, Izunokuni, Shizuoka
- Nirengi Castle, Toyohashi, Aichi
- Nishikawa Castle, Toyohashi, Aichi
- Noda Castle, Aichi Prefecture
Read more about this topic: List Of Castles In Japan