Olaf Tree Feller (Old Norse: Óláfr trételgja, Swedish: Olof Trätälja, Norwegian: Olav Tretelgja, all meaning Olaf Woodwhittler) was the son of the Swedish king Ingjald ill-ruler of the House of Yngling according to Ynglingatal.
His mother was Gauthild, a princess of West Götaland, whose maternal grandfather was Olof the Sharp-sighted, the king of Nerike.
His mother sent him to his foster-father Bove in West Götaland, where he grew up with his foster-brother Saxe who was surnamed Flette.
When Olof heard of his father's death, he assembled the men who were willing to follow him and went to his kinsmen in Nerike, because after his father's atrocities, the Swedes had grown hostile towards the Ynglings.
When the Swedes learnt that Olof and his kin had sought refuge in Nerike, they were attacked and had to head west through deep and mountainous forests (Kilsbergen) to Lake Vänern and the estuary of Klarälven (where Karlstad is now situated). Here, they settled and cleared land. Soon they had created a whole province called Värmland, where they could make a good living.
When the Swedes learnt that Olof was clearing land, they were amused and called him the Tree-feller. Olof married a woman named Solveig who was a daughter of Halfdan Guldtand of Soleyar. Olof and Solveigh had two sons, Ingjald Olofsson and Halfdan Hvitbeinn, who were brought up in Soleyar in the house of his mother's uncle Sölve.