Olof Björnsson

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| name = Olof Björnsson

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| succession = Legendary king of Sweden

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| predecessor = Björn Eriksson

| successor = Eric the Victorious

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| spouse = Ingeborg Thrandsdotter

| spouse-type = Consort

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| house = House of Munsö

| father = Björn Eriksson

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| occupation = Viking

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| religion = Norse Paganism

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Olof Björnsson, in legend, was a Swedish king who was referenced in several Old Norse Sagas including Hervarar saga, Saga of Harald Fairhair and the Styrbjarnar þáttr Svíakappa. Reconstructions that place him as a historical king date his reign to c. 970 – c. 975.

Olof was the son of Björn Eriksson who ruled as king of Sweden. After the death of their father, Olof ruled jointly with his brother Eric the Victorious (Swedish: Erik Segersäll). By his queen Ingeborg Thrandsdotter, he was the father of Styrbjörn Starke and Gyrid, queen consort of King Harald Bluetooth. He died of poison during a meal. Eric, instead of proclaiming his nephew Styrbjörn co-ruler, proclaimed his own unborn son to be co-ruler. This son ruled as the historical king Olof Skötkonung.{{cite web|url=https://runeberg.org/nfcg/0306.html|title=Styrbjörn Starke|publisher=Nordisk familjebok|date=1918|access-date=May 25, 2016}}{{cite web|url=https://runeberg.org/svenhovd/071.html|title=Hjälmdis Rider Till Erik Segersäll|publisher=Project Runeberg|author=Verner von Heidenstam|access-date=May 25, 2016}}