Mutsuo (written: 六夫, 睦郎 or 睦夫) is a masculine Japanese given name. Notable people with the name include:
(1935–2005), Japanese baseball pitcher (1918–1986), Japanese engineer (1943–2016), Japanese judge (1913–1943), Japanese sprinter (born 1937), Japanese poet and writer (1917-1938), perpetrator of the Tsuyama massacre (1957–2026), Japanese sumo wrestler
See also Matsuo (name)