Oliver Pettersson (born 13 May 2003) is a Finnish professional footballer who plays as a centre back for Veikkausliiga club Gnistan, and the Finland U21 national team.

[2] Born in Espoo, Pettersson played in youth sectors of local clubs Honka and Espoon Palloseura (EPS).

[4][5] On 12 August 2022, Pettersson signed with HJK Helsinki on a deal until the end of 2023, with an option for extension, for an undisclosed fee,[6] and was first assigned to their reserve team Klubi 04.

[7] On 27 January 2023, Pettersson made his HJK debut in Finnish League Cup match against IFK Mariehamn.

On 9 July 2024, his deal with HJK was terminated on mutual consent and Pettersson signed with fellow Veikkausliiga club Gnistan until the end of 2025.