Jónatan Gudni Arnarsson is a professional footballer from ISL and is currently 20 years old. He is on the books of Breidablik and wears shirt number 22. His main role on the pitch is Forward.

During the UEFA European U19 Football Championship 2025-2026 campaign, Jónatan Gudni Arnarsson made 3 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.