Niilo Juhani Kujasalo (born 17 March 2004) is a Finnish professional footballer who plays as a midfielder for Veikkausliiga club KuPS.
After playing in a youth sector of Käpylän Pallo (KäPa), Kujasalo joined HJK Helsinki youth academy at the age of 11.
On 14 January 2022, he signed a new deal and was promoted to the club's reserve team Klubi 04 squad, playing in third-tier level Kakkonen. He made his debut with HJK first team on 2 March 2022, in a pre-season Finnish League Cup loss against FC Honka. On 14 December 2022, Kujasalo renewed his contract with HJK until the end of 2024, with a deal including an option to extend.
On 20 April 2023, Kujasalo was loaned out to Kokkolan Pallo-Veikot (KPV) for the 2023 season, playing in second-tier level Ykkönen.
On 6 November 2024, Kujasalo joined Veikkausliiga club IFK Mariehamn on a two-year deal, starting in 2025. He scored his first league goal on 27 April, in a home match against Ilves.
On 24 December 2025, Kuopion Palloseura (KuPS) reported that they have signed Kujasalo on a two-year initial deal, that includes an option for a third year. KuPS paid a transfer fee to IFK Mariehamn.
Kujasalo has represented Finland at various youth international levels.
HJK