Olof Björnsson (ca 970 - 975), ruled together with his brother Eric the Victorious. He was the father of Styrbjörn Starke. He died of venom. Instead of proclaiming his son Styrbjörn co-ruler, Eric proclaimed his own unborn child co-ruler on condition that it was a son. It was a son who became Olof of Sweden.

See also Early Swedish Kingdoms, House of Munsö.