Fredrik Gulbrandsen (born 10 September 1992) is a Norwegian footballer who plays as a forward for Süper Lig club İstanbul Başakşehir.
Gulbrandsen began his career with his hometown club Lillestrøm. He made his debut in the Norwegian top division against IK Start in May 2009, as the youngest Lillestrøm player ever. In March 2010, he was loaned out to Lyn for the duration of the spring season. While with Lyn he made 11 appearances and scored 2 goals. He returned to Lillestrøm for the 2011 season, and on 3 July 2011 scored his first goal for the club in a 2–1 victory over Viking FK.
On 15 July 2013 Gulbrandsen signed a contract with Molde. He had a breakthrough season in 2014 appearing in 29 matches and scored 14 goals in all competitions, helping Molde to their first league and cup double in club history. On 23 November 2014, Gulbrandsen opened the scoring for Molde in a 2–0 victory over Odd in the 2014 Norwegian Football Cup Final. After an injury plagued 2015 season, Gulbrandsen regained his form scoring 4 goals in 9 matches to start the 2016 season, drawing the attention of top European sides.