The 2015 season was IFK Norrköping's 118th in existence, their 75th season in Allsvenskan and 5th consecutive season in the league. The club competed in 2015 Allsvenskan, 2014–15 Svenska Cupen (starting with group stage after qualification previous season) and 2015–16 Svenska Cupen (qualification for next season group stage). The season began with 2014–15 Svenska Cupen group stage on 22 February, with 2015 Allsvenskan starting on 4 April. The league ended with the last match on 31 October 2015, in which they became league champions, and the last match of the season was 2015 Svenska Supercupen on 8 November where IFK Norrköping, as champions, met 2014–15 Svenska Cupen winners, IFK Göteborg.

On 4 October 2015, with three matches remaining in 2015 Allsvenskan, IFK Norrköping secured a top 3 finish and a spot in European competitions for the next season. If they win the league, they will compete in 2016–17 UEFA Champions League and if they finish as runners-up or third-placed team they will compete in 2016–17 UEFA Europa League.

IFK Norrköping won the 2015 Allsvenskan in the last match of the season on 31 October 2015, defeating the champions from the previous season, Malmö FF, with 2–0. By winning 2015 Allsvenskan they qualified for 2016–17 UEFA Champions League.

One week after becoming champions of 2015 Allsvenskan, IFK Norrköping took their second title of the season when they defeated 2014–15 Svenska Cupen winners, IFK Göteborg with 3–0 in 2015 Svenska Supercupen.

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