Gustav Rudolf August Gundelach (19 December 1888 – 8 July 1962) was a German politician of the Communist Party (KPD) and former member of the German Bundestag.
He was a member of the Hamburg State Parliament for the KPD in the first legislative period after the war. In June 1947 he resigned from the Bürgerschaft as a member of parliament. Gundelach was then a member of the Zone Advisory Council in 1947/48. He was a member of the German Bundestag in the first legislative period (1949-1953).