Burger King is owned by Restaurant Brands International (RBI).
Restaurant Brands International is a Canadian multinational fast food holding company. It is one of the world's largest quick service restaurant companies with a portfolio of well-known brands. Besides Burger King, RBI also owns Tim Hortons, Popeyes Louisiana Kitchen, and Firehouse Subs. So while you can't point to one person as "the owner" of Burger King, RBI is the parent company that controls and operates the Burger King brand.
Therefore, the answer is: Restaurant Brands International.
