Thorin Oakenshield, the protagonist of J.R.R. Tolkien's The Hobbit, did not have any children.
Thorin's life was primarily focused on reclaiming his ancestral home, the Lonely Mountain, from Smaug the dragon. He was a warrior, a leader, and a staunch defender of his people. While he did have a close relationship with his nephew, Bilbo Baggins, Thorin's dedication to his lineage and the reclaiming of his homeland overshadowed any potential for starting a family.
His death in the Battle of Five Armies further solidified his single status, leaving no opportunity for him to father children.
