The 2015 season was Fjölnir's 4th season in Úrvalsdeild and their 2nd consecutive season in top-flight of Icelandic Football. Fjölnir was head coached by Ágúst Gylfason for the fourth consecutive season. He was assisted by player/assistant coach Ólafur Páll Snorrason. Along with the Úrvalsdeild, the club competed in the Lengjubikarinn and Borgunarbikarinn. The team finished the season in 6th place in the league.