Daniel Klein may refer to:
Danny Klein (born 1946), American bassist Daniel B. Klein (born 1962), professor of economics at George Mason University Daniel Klein (grammarian) (1609–1666), medieval scholar of the Lithuanian language Daniel Martin Klein (born 1939), American author Dan Klein (born 1976), American professor of computer science at the University of California, Berkeley Daniel Klein (footballer) (born 2001), German professional footballer