Mutsuo (written: 六夫, 睦郎 or 睦夫) is a masculine Japanese

given name A given name (also known as a forename or first name) is the part of a personal name quoted in that identifies a person, potentially with a middle name as well, and differentiates that person from the other members of a group (typically a f ...

. Notable people with the name include: * (1935–2005), Japanese baseball pitcher * (1918–1986), Japanese engineer * (born 1943), Japanese judge * (1913–1943), Japanese sprinter * (born 1937), Japanese poet and writer * (1917-1938), perpetrator of the

Tsuyama massacre The was a revenge mass murder that occurred on the night of 21 May 1938 in the rural village of Kamo close to Tsuyama in Okayama, Empire of Japan. , a 21-year-old man, killed 30 people, including his grandmother, with a Browning Auto-5, Brownin ...

* (born 1957), Japanese sumo wrestler

See also