Onni Hänninen is a 21-year-old professional football player from FIN. He currently plays for KTP Kotka, wearing the number 21 shirt. He plays primarily as a Forward. His preferred foot is Right. His current market value is estimated at 50K €.

His most recent move was a from SJK Seinäjoki to KTP Kotka on 2025-12-31.

In the Finnish Ykkosliiga 2025 season, Onni Hänninen scored 9 goals and provided 3 assists across 27 appearances, averaging 0.3 goals per game with 0 shots attempted and 0 on target.