Henri Mulet (born October 17, 1878 in Paris, † September 20, 1967 in Draguignan) was a French organist and composer.
He studied at the Paris Conservatoire under Charles-Marie Widor and Alexandre Guilmant. He was organist at various churches in Paris and taught at the École Niedermeyer de Paris and at the Schola Cantorum from 1924 to 1931. From 1937 to 1958 he was organist at the cathedral of Draguignan.
His most famous work are the Esquisses byzantines (1914-19), especially the last sentence, the Toccata on "Tu es petra et portae infer non praevalebunt adversus te", meaning "You are the rock, and the gates of hell will not prevail against you". He died childless in 1967 in a monastery.