Joseph Haas (19 March 1879 – 30 March 1960) was a German late romantic composer and music teacher.
He was born in Maihingen, near Nördlingen to teacher Alban Haas from his second marriage, being half-brother to the theologian and historian Alban Haas. At an early age he came into contact with music. He became a teacher himself and taught from 1897 to 1904 in Lauingen near the Danube. The work of Haas was entirely based on tonality. At first, he was strongly influenced by his mentor Max Reger, whose language of polyphony and harmony also featured in Haas's music.
