Magnús Óláfsson (died 1265) was King of Mann and the Isles.
Magnús Óláfsson may also refer to:
Magnus the Good (1024–1047), or Magnus I, King of Norway Magnus Barefoot (1073–1103), or Magnus III, King of Norway Magnús Ólafsson (swimmer) (born 1967), Icelandic swimmer Magnús Ólafsson (actor), Icelandic actor, comedian, singer and former handball player