Vaclovas Sidzikauskas (10 April 1893 – 2 December 1973) was a prominent diplomat in interwar Lithuania and post-war anti-communist. Educated at the University of Fribourg and Moscow University, Sidzikauskas joined the newly established Lithuanian Ministry of Justice. In October 1919, he was sent to Switzerland and, after the resignations of Jurgis Šaulys, became the Lithuanian diplomatic representative to Switzerland and a member of several Lithuanian delegations to the League of Nations. Sidzikauskas was transferred as the Lithuanian representative in Berlin in June 1922. The position became a key posting in Lithuanian foreign affairs after the Klaipėda Revolt in January 1923. He was one of the negotiators of the Klaipėda Convention which recognized Klaipėda Region (Memelland) as an auton