Tronstad is a surname of Norwegian origin. Notable people with the surname include:
Bjørn Tronstad (born 1957), Norwegian footballer Elsbeth Tronstad (born 1956), Norwegian businessperson and politician Leif Tronstad (1903–1945), Norwegian scientist, intelligence officer and military organizer Sondre Tronstad (born 1995), Norwegian footballer
See also Tronstad, a village in Viken, Norway