Delius is a surname. Notable people with the surname include:
Frederick Delius (1862–1934), English composer Friedrich Christian Delius (1943–2022), German writer Fritz Delius (1890–1966), German actor Ernst von Delius (1912–1937), German racing car driver Nicolaus Delius (1813–1888), German philologist Tobias Delius (born 1964), English jazz musician
Fictional characters: Max Delius, fictional character in the 1992 novel The Discovery of Heaven
See also Deliu, another surname