Anton Adriaan Mussert (; 11 May 1894 – 7 May 1946) was a Dutch politician who co-founded the National Socialist Movement in the Netherlands (NSB) in 1931 and served as its leader until the party was banned in 1945. As such, he was the most prominent Dutch fascist before and during World War II. Mussert collaborated with the German occupation government, but was granted little actual power and held the nominal title of "Leider van het Nederlandsche Volk" ("Leader of the Dutch People") from 1942 onwards. In May 1945, as the war came to an end in Europe, Mussert was captured and arrested by Allied forces. He was charged and convicted of treason, and was executed in 1946.