The Landtag of the newly established Free State of Thuringia (Freistaat Thüringen) first convened in 1920 in Weimar.
Its deputies were elected for three years according to a proportional representation system, with a minimum voting age of 21.
During the Weimar Republic period until 1933, six state elections were held.
Upon the 1929 elections, Thuringia became one of the first German federal states where the Nazi Party gained real political power.
Wilhelm Frick was appointed Minister of the Interior for the state of Thuringia after the NSDAP won six delegates to the Landtag.
In the 1932 elections the Nazis emerged as the strongest party with 26 of 61 seats and Fritz Sauckel assumed the office of Minister-President.
One year later, after the Nazi seizure of power in Berlin, the Landtag diet was dissolved in course of the Gleichschaltung process.

After World War II, the State of Thuringia was re-established as part of the Soviet occupation zone.
On 13 June 1946 the Soviet Military Administration summoned a state assembly (Landesversammlung) chaired by Ricarda Huch; the first post-war Landtag elections were held on 20 October 1946 and the constituent meeting took place on November 21 at the Elephant hotel in Weimar.
By the 1949 Constitution of East Germany, the Landtag diets were largely deprived of power and the second state elections on 15 October 1950 were already held under the terms of the National Front unity list.
In 1952, the East German government dissolved the federal states and Thuringia was divided into districts (Bezirke) centered in Erfurt, Gera and Suhl.

The State of Thuringia was restored during Germany's reunification and Landtag elections were again held on 14 October 1990.
The Landtag of the newly established Free State of Thuringia (Freistaat Thüringen) first convened in 1920 in Weimar. Its deputies were elected for three years according to a proportional representation system, with a minimum voting age of 21. During the Weimar Republic period until 1933, six state elections were held. Upon the 1929 elections, Thuringia became one of the first German federal states where the Nazi Party gained real political power. Wilhelm Frick was appointed Minister of the Interior for the state of Thuringia after the NSDAP won six delegates to the Landtag. In the 1932 elections the Nazis emerged as the strongest party with 26 of 61 seats and Fritz Sauckel assumed the office of Minister-President. One year later, after the Nazi seizure of power in Berlin, the Landtag diet was dissolved in course of the Gleichschaltung process.
After World War II, the State of Thuringia was re-established as part of the Soviet occupation zone. On 13 June 1946 the Soviet Military Administration summoned a state assembly (Landesversammlung) chaired by Ricarda Huch; the first post-war Landtag elections were held on 20 October 1946 and the constituent meeting took place on November 21 at the Elephant hotel in Weimar. By the 1949 Constitution of East Germany, the Landtag diets were largely deprived of power and the second state elections on 15 October 1950 were already held under the terms of the National Front unity list. In 1952, the East German government dissolved the federal states and Thuringia was divided into districts (Bezirke) centered in Erfurt, Gera and Suhl.
The State of Thuringia was restored during Germany's reunification and Landtag elections were again held on 14 October 1990.
Landtag of Thuringia