King Harold or Harald may refer to:

Kings of England

Harold Harefoot, or Harold I (c. 1015–1040)

Harold Godwinson, or Harold II (c. 1022–1066)

Kings of Denmark

Harald Bluetooth (935–985/986)

Harald II of Denmark (c. 996–1018)

Harald III of Denmark (1040–1080)

Kings of Norway

Harald Fairhair (850–933)

Harald Greycloak (c. 935–970)

Harald Hardrada (1015–1066)

Harald Gille (c. 1102–1136)

Harald V of Norway (born 1937)

Others

Harald I Olafsson (died 1248), King of Mann & the Hebrides

King Harold (Shrek), fictional character in films