Trondsen is a surname. Notable people with the name include:
Anders Trondsen (born 1995), Norwegian footballer Erling Trondsen (born 1959), Norwegian swimmer Johan Trondsen (1922–2018), Norwegian politician Christoffer Trondsen Rustung (c. 1500–1565), Norwegian admiral Nils Trondsen Thune (1835–??), Norwegian politician Trond Trondsen (born 1994), Norwegian cyclist