Welhaven is a protected Norwegian surname. Notable people with the surname include:
Elisabeth Welhaven (1815–1901), Norwegian writer Hjalmar Welhaven (1850–1922), Norwegian architect, palace manager, and sportsman Johan Sebastian Welhaven (1807–1873), Norwegian writer, poet, critic and art theorist Kristian Welhaven (1883–1975), Norwegian police chief Sigri Welhaven (1894–1991), Norwegian sculptor Johan Ernst Welhaven (1775–1828), Norwegian priest and father of Johan Sebastian Welhaven.