Lieutenant-General Nicolaas Nieuwoudt SSA SD SM (1929–1989) was a South African military commander. A medical doctor, he joined the South African Air Force's medical branch in 1960, after five years private practise. He commanded the South African Medical Service, as Surgeon-General, from 1977 to 1988. The SAMS was upgraded to rank equally with the Army, Air Force, and Navy in 1979.