Sadao Bekku (別宮貞雄 Bekku Sadao?, May 24, 1922, Tokyo – January 12, 2012, Mitaka, Tokyo), was a Japanese classical composer. His works include five symphonies, film scores, a flute sonata, a piano concerto, choral work and art songs, and the opera, Prince Arima.
His work took strong influence from jazz. His most famous works include the film score, Matango (1963).
Bekku composed about 40 film scores from 1954 to 1978.