Stefan Lassen (born 1 November 1985) is a Danish professional ice hockey defenseman who currently plays for Almtuna IS in the HockeyAllsvenskan (Allsv).

He moved to Sweden in 2009 with Leksands IF of the HockeyAllsvenskan before joining Elitserien club Djurgårdens IF the following season on 31 May 2010.

[1] After a season stint in the EBEL with Austrian club Graz 99ers, Lassen moved to Finland signing a two-year contract with the Lahti Pelicans of the Liiga on 27 March 2015.

[3] Lassen has participated in two IIHF World Championships before joining Leksands IF in May 2009.

[4] Lassen was named for the Danish team again in the 2010 IIHF World Championship.