|Haraldr Guðrøðarson was a mid-13th century King of the Isles who ruled an island-kingdom which encompassed the Isle of Mann (Mann) and portions of the Hebrides. He was the son of Guðrøðr Rögnvaldsson, King of the Isles, who was the son of Rögnvaldr Guðrøðarson, King of the Isles. Haraldr and his predecessors were members of the Crovan dynasty.
In 1249, Rögnvaldr Óláfsson was slain by a knight who appears to have been an accomplice of Haraldr, who took control of the island-kingdom and replaced the chieftains of the old regime with followers of his own choosing. He was initially recognised as the legitimate ruler of the kingdom by Henry III, King of England, but was summoned to Norway by Hákon Hákonarson, King of Norway in 1250, for his seizure of the kingdom. Upon his removal from Mann, Haraldr is not heard from again.