Harald II Greycloak (Old Norse: Haraldr gráfeldr, Norwegian: Harald Gråfell, Danish: Harald Gråfeld) (died 970) was a king of Norway. Harald Greycloak was the son of Eirik Bloodaxe and a grandson of Harald Fairhair. His mother was Gunnhild Gormsdatter, the sister of King Harald I of Denmark. After his father's death in 954, Harald and his brothers allied with their grandfather, King Harald Gormson, against King Haakon I of Norway. They fought several battles against King Haakon including the Battle of Rastarkalv near the island of Frei in 955 and the Battle of Fitjar in 961.