Caspar Ett (5 January 1788, Eresing – 16 May 1847, München) was a German composer and organist.
In 1804 he completed his secondary studies at the "Paedagogium" in Munich, now called the Wilhelmsgymnasium. Ett studied at the Electoral Seminar in Munich and in 1816 became the court organist at St. Michael's Church. Ett is also credited in the revival of choral music from the 16th to the 18th century. He composed for the Catholic Church, but also works for Greek Orthodox and Jewish worship. He was the music teacher of King Maximilian II. A street was named after Caspar Ett in Eresing. In the Munich city centre there is also an 'Ettstraße'.
His grave is located in the Old South Cemetery in Munich.