Johann Georg Hasler (7 January 1895 – 16 May 1976) was a politician from Liechtenstein who served in the Landtag of Liechtenstein from 1949 to 1953, and again from 1957 to 1958. He also served as a government councillor from 1941 to 1945 and as the mayor of Eschen from 1951 to 1963.