Seidl is a surname. Notable people with the surname include:
Anton Seidl (1850–1898), Hungarian conductorGabriel von Seidl (1848-1913), German architectJohann Gabriel Seidl (1804-1875), Austrian archaeologist, lyricist, narrator and dramatistOtto Seidl (born 1931), until 1998 vice-president of the German Supreme CourtSiegfried Seidl (1911-1947), Commander of the concentration camp at TheresienstadtUlrich Seidl (born 1952), director, screen writer and producerFlorian Seidl (born 1979), vehicle designer