Fumio Hayasaka (早坂 文雄 Hayasaka Fumio; August 19, 1914 – October 15, 1955) was a Japanese composer of classical music and film score.

Hayasaka was born in the city of Sendai on the main Japanese island of Honshū. In 1918, Hayasaka and his family moved to Sapporo on the northern island of Hokkaidō. In 1933, Hayasaka and Akira Ifukube organized the New Music League, which held a new music festival the year after.

Hayasaka won a number of prizes for his early concert works; in 1935, his piece Futatsu no sanka e no zensōkyoku won first prize in a radio competition, and another concert piece, Kodai no bukyoku, won the 1938 Weingartner Prize. Other early works include a Nocturne (1936) for piano and the orchestral Ancient Dance (1938). In 1939, Hayasaka moved to Tokyo to begin a career as film composer. By early 1940, Hayasaka was seen as “a major composer for Japanese Cinema”.