Onni Jalmari Tiihonen (born 6 June 2000) is a Finnish professional footballer who plays as a central midfielder for Veikkausliiga club AC Oulu.
[2][3] He played with the club in the third-tier Kakkonen and in the second-tier Ykkönen after the promotion.
[4] After a short stint with AB Argir in the Faroe Islands Premier League in 2022, Tiihonen moved to Romania.
[5][6][7] In July 2023, Tiihonen signed with Viitorul Târgu Jiu in Romanian second-tier Liga II.
[8] For the 2024–25 season, he joined a newly promoted Liga II club Unirea Ungheni.