Karl O'Sullivan is a professional footballer from IRL and is currently 27 years old. He is on the books of Treaty United and wears shirt number 34. His main role on the pitch is Forward.

During the Ireland First Division 2025 campaign, Karl O'Sullivan made 29 appearances, scoring 1 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.