King Olaf, King Olav, or similar, may refer to:
Kings of Denmark
Olof the Brash (9th century), founder of the House of Olaf
Olaf I of Denmark (c. 1050–1095), ruled 1086–1095
Olaf (II) Haraldsen (died c. 1143), 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 c. 875), possibly synonymous with Olaf the White
Amlaíb mac Gofraid (died 941), ruled 934–941, also King of Northumbria
Amlaíb Cuarán, (c. 926–981), also King of Northumbria
Kings of Mann and the Isles
Olaf I Godredsson (c. 1080–1153)
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 (c. 1050–1093), 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 (fl. 854)
Olof (II) Björnsson, ruled c. 970–975
Olof Skötkonung (c. 980–1022), 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