Onni Hänninen is a professional footballer from FIN and is currently 22 years old. He is on the books of KTP Kotka and wears shirt number 21. His main role on the pitch is Forward. His estimated market valuation currently stands at 50K €.

His latest transfer saw him join KTP Kotka from SJK Seinäjoki via on 2026-01-01.

During the Finnish Ykkosliiga 2025 campaign, Onni Hänninen made 27 appearances, scoring 9 goals and adding 3 assists. He averaged 0.3 goals per match from 0 shots, with 0 on target.