King Olaf, King Olav, or similar, may refer to:

Kings of Denmark Any of several legendary kings of the Danes: Olaf, son of Ingeld, according to Danish sources (e.g. Chronicon Lethrense, Sven Aggesen, Gesta Danorum) Olafr litillati ("the Humble") or Olaf the Gentle, another name for Offa of Angel (Uffe), son of Wermund, according to Gesta Danorum and Langfeðgatal Olaf, son of Gotric according to Gesta Danorum Olof the Brash (9th century), founder of the House of Olaf Olaf I of Denmark (–1095), ruled 1086–1095 Olaf (II) Haraldsen (died ), Danish anti-king who ruled Scania for a few years from 1139 Olaf II of Denmark, (1370–1387), ruled 1376–1387, also King of Norway as Olaf IV

Kings of Dublin Amlaíb Conung, (died ), possibly synonymous with Olaf the White Amlaíb mac Gofraid (died 941), ruled 934–941, also King of Northumbria Amlaíb Cuarán, (–981), also King of Northumbria

Kings of Mann and the Isles Olaf I Godredsson (–1153) Olaf the Black (1173/4–1237), ruled 1229–1237

Kings of Norway Olav I of Norway(960s–1000), Olav Trygvason, ruled 995–1000 Olav II of Norway (995–1030), Olav Haraldson, ruled 1015–1028, canonised Olav III of Norway (–1093), Olav Kyrre, ruled 1067–1093 Olav Magnusson of Norway (1099–1115), ruled 1103–1115 Olav IV of Norway (1370–1387), ruled 1380–1387, also King of Denmark as Olav II Olaf V of Norway (1903–1991), ruled 1957–1991

Kings of Sweden Olof (I) of Sweden () Olof (II) Björnsson, ruled Olof Skötkonung (–1022), ruled 995–1022

Other people Olaf the White (9th century), Viking sea-king, possibly synonymous with Amlaíb Conung Amlaíb Cenncairech, King of Limerick, ruled 932–937 Amlaíb of Scotland, (died 977), King of Scots King Olaf of Camelot, fictional ruler in the television series Merlin; see List of Merlin characters

Other uses The Saga of King Olaf, a poem by Henry Wadsworth Longfellow Scenes from the Saga of King Olaf, choral work by Edward Elgar based on the Longfellow poem

See also Óláfs saga (disambiguation)