Olavsson or Olavssøn is a given name and a surname. Notable people with the name include:
Jens Olavssøn Bratt (1505–1548), Norwegian clergyman Eivind Olavsson Groven (1901–1977), Norwegian composer and music-theorist Gunnar Olavsson Helland (1852–1938), Norwegian Hardanger fiddle maker Talleiv Olavsson Huvestad (1761–1847), Norwegian teacher, farmer and politician Konráð Olavsson (born 1968), Icelandic Olympic handball player Therese Olavsson (born 1968), Swedish equestrian Tryggve Olavsson (928 – c. 963), king of Viken, Norway (Vingulmark and Rånrike) Aasmund Olavsson Vinje (1818–1870), Norwegian poet and journalist
See also Olofsson Olufsen Ólafsson