Gustav Friedrich Hartlaub (12 March 1884 – 30 April 1963) was a German art historian, critic, and curator. He was born in Bremen into a merchant family. He studied with Franz Wickhoff in Vienna and Heinrich Wölfflin in Berlin, among others, until 1910 and then initially worked as assistant to Gustav Pauli at the Kunsthalle Bremen. Hartlaub became the director of the Kunsthalle Mannheim in 1923. He was particularly committed to the promotion of contemporary art. New Objectivity as defined by Hartlaub comprised two stylistic tendencies: