Birkir Thorsteinsson is a professional footballer from ISL and is currently 17 years old. He is on the books of Breidablik and wears shirt number 77. His main role on the pitch is Forward. His stronger foot is Right.

During the Iceland Besta-deild karla 2025 campaign, Birkir Thorsteinsson made 4 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.