M. O’Mahony is a professional footballer from IRL and is currently 22 years old. He is on the books of Reading and wears shirt number 20. At international level, he features for Ireland U21. His main role on the pitch is Forward. His stronger foot is Right. His estimated market valuation currently stands at 375K €.

His latest transfer saw him join Brighton U23 from Reading via Loan on 2026-05-31.

During the English Football League One 2025-2026 campaign, M. O’Mahony made 17 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 10 shots, with 3 on target.