Harold I (died 17 March 1040), commonly known as Harold Harefoot, was King of England from 1037 to 1040. His nickname "Harefoot" is first recorded as "Harefoh" or "Harefah" in the twelfth century in the history of Ely Abbey, and according to some late medieval chroniclers it meant that he was "fleet of foot".

The son of Cnut the Great and Ælfgifu of Northampton,