Lasse Nilsen (born 21 February 1995) is a Norwegian football defender who currently plays for the Norwegian First Division side Tromso IL.
He hails from Bleik and started his youth career in Hoken, moving on to Andenes around his early teens. He then went to the regional great team Tromso IL, with whom he signed a professional contract in April 2014. He plays as a left back or winger.
He made his first team debut in the 2014 Norwegian First Division, which ended with Tromso being promoted, and made his first-tier debut in May 2015 against Odd.
In April 2018, he scored his first goal against Ranheim IL in a 4-0 win. He also scored the deciding goal in a 2-1 win against Rosenborg BK in June 2018.