İstanbulspor Kulübü is a Turkish football and sports club founded by Istanbul High School students in 1926.

For many decades, it was the fourth most famous and well-developed professional football club in Istanbul, coming after Beşiktaş, Galatasaray, and Fenerbahçe.

[3] İstanbulspor was founded by Kemal Halim Gürgen, also known by his native Albanian name of Qemal Omari[4][5][6][7] and Istanbul Boys High School students.

Istanbulspor became one of the most successful Turkish football clubs again, as they reached fourth place in the 1997–98 season and played in the UEFA Cup.

In 2006, İstanbulspor were resold by the government to former Turkish player Saffet Sancaklı's Marmara Spor Faaliyetleri San.

Having represented Turkey in an international competition, İstanbulspor was granted the privilege to use the Turkish flag in its emblem, located on the top left corner.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.