Leo Onni Artturi Väisänen (born 23 July 1997) is a Finnish professional footballer who plays as a centre back for Austin FC in Major League Soccer[1] and the Finland national team.

[7] Väisänen made his debut for Den Bosch on 21 September 2018, in a match against Almere; he was substituted on the 61st minute for Stefano Beltrame.

[9][10][11][12] On 4 January 2023, it was announced Väisänen had signed with Major League Soccer (MLS) side Austin FC on a four-year deal, with an option for a further year.

[15] He made his Finland national football team debut on 11 June 2019 in a Euro 2020 qualifier against Liechtenstein, as an 86th-minute substitute for Jukka Raitala.

[17] On 1 June 2021 Markku Kanerva published the national team for the UEFA Euro 2020 tournament and Väisänen was named as one of the defenders.