Herbert Weichmann (23 February 1896 – 9 October 1983) was a German lawyer and politician (Social Democratic Party) and First Mayor of Hamburg (1965–1971).

Weichmann was born in Landsberg, Upper Silesia, then part of the German Reich (now Gorzów Śląski, Poland), to a Jewish[1] family of physicians.

After the war Weichmann studied law at the Silesian Friedrich Wilhelm University, Breslau, and graduated (Dr.

In 1928 he married Elsbeth Greisinger and was appointed as liaison officer to Prime Minister of Prussia Otto Braun.

After the takeover of power (1933) by the Nazi Party Weichmann fled first to Czechoslovakia, then to France—with a short term of imprisonment (1939–1940)—Spain, Portugal and later the United States.