Hans Achim Litten (June 19, 1903 – February 5, 1938) was a German lawyer who represented opponents of the Nazis at important political trials between 1929-32, defending the rights of workers during the Weimar Republic.During one trial in 1931, Litten subpoenaed Adolf Hitler, to appear as a witness, where Litten then cross-examined Hitler for three hours. Hitler was so rattled by the experience that, years later, he would not allow Litten's name to be mentioned in his presence.