Harthacanute (Canute the Hardy, sometimes Hardicanute, Hardecanute; Danish: Hardeknud) (1018 – 8 June 1042) was King of Denmark from 1035 to 1042 and England from 1040 to 1042. He was the only son of Canute the Great and Emma of Normandy.
He followed his father as King of Denmark in 1035, becoming Canute III. Fighting with Magnus I of Norway stopped him from sailing to England to take up his throne. His older, illegitimate half-brother, Harold Harefoot, became regent of England.