Henri Büsser (16 January 1872 – 30 December 1973) was a French classical composer, organist, and conductor.
Paul-Henri Büsser was born in Toulouse, of partly German ancestry. He entered the Paris Conservatoire in 1889, where he studied organ with César Franck and composition with Ernest Guiraud. Employed for a while as secretary to Charles Gounod he received valuable advice from that composer, who helped him obtain a job as organist at Saint-Cloud. In 1893 he won the Prix de Rome for music, and on his return from Italy he began a career as a conductor. At the personal request of Claude Debussy, Büsser led the fourth performance, and numerous subsequent performances, of Pelléas et Mélisande. He also became a protégé of Jules Massenet, and was one of the elder composer's closest friends during the last two decades of the latter's life (Massenet died in 1912).
In 1921 Büsser began teaching at the Paris Conservatoire, and was promoted to professor of composition in 1931. Noted students include Prix de Rome winner Henri Challan, the Japanese composer Tomojirō Ikenouchi (1906–1991) and Henri Dutilleux (1916-2013). The Académie française elected him as member in 1938. He married the famous dramatic soprano Yvonne Gall (1885–1972).
While Büsser composed a wide range of compositions, his most important works were for the stage. His operas include Daphnis et Chloé, Colomba and Les noces corinthiennes. Several stage works demonstrate his comic wit, especially Le carosse du Saint Sacrement and Roxelane as well as the farce Diaforus 60, an update of Molière's Le malade imaginaire. He composed in a sophisticated compositional style with finely crafted orchestration, but remained faithful to 19th-century French tradition.