The 2015–16 season was Football Club Barcelona's 116th in existence and the club's 85th consecutive season in the top flight of Spanish football. Barcelona was involved in six competitions after completing the Treble during the last season.

On 7 June, Barcelona announced the transfer of right-wing Aleix Vidal from fellow La Liga outfit and 2015 UEFA Europa League winners Sevilla. The player will join on a 5-year deal with a transfer fee of 18 million euros plus variables. On 9 June, the club announced that right back Dani Alves is set to stay at the club after signing a contract renewal for two years with an option for another year. On 10 June, Barcelona announced that the presidential elections will take place on Saturday 18 July 2015, after Josep Bartomeu resigned as president to qualify for re-election. On 25 June, Barcelona announced La Masia graduate Gerard Deulofeu was transferred to English side Everton for a reported fee of €6 million. The player returned to Merseyside after spending the 2013–14 season on loan there under fellow Spaniard manager Roberto Martínez.

On 3 July, Barcelona announced that La Masia graduate Martín Montoya would join Italian side Internazionale on a season-long loan with an option for a second. On 6 July, Barcelona announced the signing of Turkey national team captain Arda Turan from Atlético Madrid for €34 million. The player will join on 1 January 2016 after the FIFA transfer ban is lifted. On 18 July, Josep Bartomeu was elected president of Barcelona for the next six years with the third most votes in the club's history. On 21 July, Barcelona kicked-off the preseason with a 1–2 victory over Major League Soccer champions LA Galaxy in the 2015 International Champions Cup. Goals from Luis Suárez and Sergi Roberto secured the win in front of a crowd of 93,226 at the Rose Bowl in Pasadena, California. On 23 July, Barcelona were fined €30,000 by UEFA for fans waving pro-Catalan independence banners at the 2015 UEFA Champions League Final. The club maintains its respect for the sanction, yet does not agree with it and its legal services will consider the possibility of questioning the fine at a later time. On 25 July, Barcelona were defeated by English side Manchester United with a scoreline of 1–3 at Levi's Stadium in Santa Clara, California. The lone goal came from Rafinha in the 89th minute of play. On 28 July, Barcelona were defeated in penalties by Chelsea at FedExField in Landover, Maryland. Goals from Luis Suárez and Sandro were enough to earn the regular time draw, however the team lost in penalties 4–2 to end their United States Summer Tour.

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