Birkir Thorsteinsson is a 17-year-old professional football player from ISL. He currently plays for Breidablik, wearing the number 77 shirt. He plays primarily as a Forward. His preferred foot is Right.

In the Iceland Besta-deild karla 2025 season, Birkir Thorsteinsson scored 0 goals and provided 0 assists across 4 appearances, averaging 0 goals per game with 0 shots attempted and 0 on target.