İstanbul Başakşehir F.K.  İstanbul Başakşehir Futbol Kulübü () is a Turkish professional football club based in the Başakşehir district of Istanbul. The club is better known as İstanbul Başakşehir or, due to sponsorship, Medipol Başakşehir (). The club was founded in 1990 as İstanbul Büyükşehir Belediyespor. They first reached the highest level in Turkish Football in 2007–08. They play their home games at the Fatih Terim Stadium in Istanbul and are owned by the Ministry of Youth and Sports. The club is one of five Süper Lig teams based in Istanbul, along with Fenerbahçe, Galatasaray, Beşiktaş and Kasımpaşa. In the 2016–17 season, they participated in the Süper Lig, Turkish Cup and UEFA Europa League. In the 2017–18 season they reached the play-off round of the UEFA Champions League qualifying round. The club was founded in 1990. The club's former name was "ISKI SK" and they were owned by the municipality's water distribution company. ISKI SK competed in the Regional Amateur Football League in the 1990–91 season and were promoted to the TFF Second League. After promotion, the club's name changed to İstanbul Büyüksehir Belediyesi. The club played in the TFF Second League until 1996, but after the 2006–07 season they were promoted to the Süper Lig. Finishing 12th in the 2007–08 season enabled them to remain in the Süper Lig for the 2007–08 season. In the 2009–10 season, the club finished the season in 6th place. In the 2012–13 season, the club finished 16th and relegated to the TFF First League. But it finished in the TFF First League as champions and made an immediate return to the top level in the 2013–14 season. In June 2014, the club's name changed to "İstanbul Başakşehir Futbol Kulübü". On following seasons 2014–15 and 2015–16 the club finished in 4th place. On 25 May 2015, İstanbul Başakşehir Futbol Kulübü signed a sponsorship agreement with "Medipol Eğitim ve Sağlık Grubu" (Medipol Education and Health Group) for four years and the team's name changed to "Medipol Başakşehir Futbol Kulübü".