Lunan Ruben Gabrielsen (born 10 March 1992) is a Norwegian professional footballer who plays as a centre-back for Lillestrøm.

On 4 April 2009, Gabrielsen became the youngest ever Lillestrøm player to debut in the Eliteserien in a game against Aalesunds at the age of 17 years and 25 days.

[3] He made his debut in the first leg of the UEFA Europa League third qualifying round tie against Zorya Luhansk on 31 July 2014.

[7] On 24 January 2022, Gabrielsen signed a two-year deal with Major League Soccer club Austin FC ahead of their 2022 season.

[10] Gabrielsen was called up to the senior Norway squad for a friendly against Belgium in June 2016.