Gregor Straßer (31 May 1892 – 30 June 1934) , often Strasser in English, was a German politician and an early member of NSDAP. He participated in the Munich Putsch. He later was important in the growth of the NSDAP, especially in northern Germany.
He was the brother of Otto Straßer. The Straßer brothers supported relatively more left-wing views within the NSDAP, such as the nationalization of the economy, causing conflicts with Adolf Hitler. In 1932, there was an attempt by the Chancellor Kurt von Schleicher to split the NSDAP with Straßer's help. However, instead, Straßer had to to exist politics. In 1933, he was killed during the Night of the Long Knives.