Heidi Karoliina Kollanen (born 6 June 1997) is a Finnish footballer who plays as a forward for Vittsjö GIK and the Finland national team.
At the beginning of the year, Kollanen suffered a knee injury. On 15 September 2018, Kollanen scored all 5 goals in a 5-1 win over Turun Palloseura. On 28 November 2017, Kollanen was announced at PK-35 Vantaa. During the club's 2018 season, she was the PK-35 Vantaa's top scorer.
On 20 November 2018, Kollanen was announced at Tavagnacco in Serie A.
On 15 December 2020, Kollanen extended her contract with KIF ÃÂrebro. On 30 December 2022, Kollanen signed a contract extension with the club.
On 22 December 2023, Kollanen was announced at Vittsjö GIK on a two year contract.
Kollanen has been capped for the Finland national team, appearing for the team during the 2019 FIFA Women's World Cup qualifying cycle. She scored her first international goal against Albania on 2 September 2019, scoring in the 26th minute. Kollanen scored her second international goal on 8 October 2019, scoring against Albania in the 9th minute. She scored her third international goal against Romania on 22 February 2023, scoring in the 44th minute.
Kollanen was called up to the 2019 Cyprus Women's Cup squad.
Kollanen was called up to the 2020 Cyprus Women's Cup squad.
Kollanen was called up to the UEFA Women's Euro 2022 squad.
Kollanen was part of the Finland squad that won the 2023 Cyprus Women's Cup for the first time.
On 19 June 2025, Kollanen was called up to the Finland squad for the UEFA Women's Euro 2025.