Assaat Datuk Mudo (18 September 1904 – 16 June 1976), known as Mr. Assaat, was born in , Agam, West Sumatera, Dutch East Indies (now Indonesia). He was the only President of the Yogyakarta-based Republic of Indonesia before it became the part of the United States of Indonesia, and was in office from December 1949 until August 1950. He and a number of Indonesia founders, fought for the independence of Indonesia from the Dutch.