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