Konrad Ernst Eduard Henlein (6 May 1898 – 10 May 1945) was a Sudeten German politician in Czechoslovakia before World War II. After Nazi Germany invaded and occupated Czechoslovakia he became the Gauleiter and Reichsstatthalter of Reichsgau Sudetenland.
Born in the Austro-Hungarian Empire in 1898, Henlein served in the Austro-Hungarian Army in World War I. The Austrian Empire collapsed after that, and the Sudetenland, where Henlein lived, became part of newly created Czechoslovakia.
The Reichsgau Sudetenland was an administrative division of Nazi Germany from 1939 to 1945. It comprised the northern part of the Sudetenland territory, which was annexed from Czechoslovakia according to the 30 September 1938 Munich Agreement. The Reichsgau was headed by the former Sudeten German Party leader, now Nazi Party functionary Konrad Henlein as Gauleiter and Reichsstatthalter. From October 1938 to May 1939, it was the regional subdivision of the Nazi Party in that area, also under Henlein's leadership. The administrative capital was Reichenberg (Liberec).
The Sudeten German Party (German: Sudetendeutsche Partei, SdP, Czech: Sudetoněmecká strana) was created by Konrad Henlein under the name Sudetendeutsche Heimatfront ("Front of the Sudeten German Homeland") on 1 October 1933, some months after the First Czechoslovak Republic had outlawed the German National Socialist Workers' Party (Deutsche Nationalsozialistische Arbeiterpartei, DNSAP). In April 1935, the party was renamed Sudetendeutsche Partei following a mandatory demand of the Czechoslovak government. The name was officially changed to Sudeten German and Carpathian German Party (Sudetendeutsche und Karpatendeutsche Partei) in November 1935.
With the rising power of Nazi Party in Germany, the Sudeten German Party became a major pro-Nazi force in Czechoslovakia with the explicit official aim of breaking the country up and joining it to the Third Reich. By June 1938, the party had over 1.3 million members, i.e. 40.6% of ethnic-German citizens of Czechoslovakia. During the last free democratic elections before the German occupation of Czechoslovakia, the May 1938 communal elections, the party gained 88% of ethnic-German votes, taking over control of most municipal authorities in the Czech borderland. The country's mass membership made it one of the largest fascist parties in Europe at the time.