Josef Duchac (born February 19, 1938) is a German politician (CDU).
The studied chemical engineer became a member of the East German Christian Democratic Union in 1957.
After the party merged with the West German CDU following the German reunification, he was elected Thuringia's first post-reunification minister-president on October 14, 1990.
On January 23, 1992, he announced his resignation because of alleged Stasi contacts and was succeeded by Bernhard Vogel on February 5, 1992.
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