Lothar Mosler (2 March 1913 – 28 November 1995) was a mainstream East German historian who arrived at his university career through the political route. Between 1953 and 1961 he served as director of the Franz Mehring Institute for training teachers in Marxist-Leninist Sociological Studies, which was a core (and for much of the time compulsory) base module for students at the Karl Marx University (as it was known between 1953 and 1991) of Leipzig. Between 1958 and his retirement in 1978 Prof. Mosler taught the History of the German Labour Movement at the university.