Surya Bahadur Thapa ( March 21, 1928 – April 15, 2015) was a Nepalese politician. He has served as the Prime Minister of Nepal for five terms, under three different kings, in a political career lasting more than 50 years. His terms were 1963-64, 1965–69, 1979–83, 1997–98 and 2003-04.