Musou or Musō may refer to:
- The Japanese name for the Koei Tecmo Warriors franchise
- Musou gauge, used in the Samurai Warriors series of video games
- Musou mode, used in the Dynasty Warriors series of video games
- Muso (InuYasha), a minor character from InuYasha
People with the surname Musō include:
- Musō Soseki (1275–1351), Japanese Zen master
- Musō Gonnosuke, early 17th-century samurai