August Landmesser (born 24 May 1910; KIA 17 October 1944; confirmed in 1949) was a worker at the Blohm+Voss shipyard in Hamburg, Germany.
He is known as the possible identity of a man appearing in a 1936 photograph, conspicuously refusing to perform the Nazi salute with the other workers.
Landmesser had run afoul of the Nazi Party over his unlawful relationship with Irma Eckler, a Jewish woman.
He was later imprisoned and eventually drafted into penal military service, where he was killed in action; Eckler was sent to a concentration camp where she was presumably killed.