Istanbul Open

The Istanbul Open (also known as the TEB BNP Paribas Istanbul Open for sponsorship purposes) was a men's tennis event on the ATP Tour held in the Turkish city of Istanbul. From 2015 to 2018, it was part of the ATP 250 Series. The tournament was played on outdoor clay courts. This was the first Turkish ATP World Tour event.

The inaugural tournament was held from 27 April to 3 May 2015 at the "Koza World of Sports" facility, which is promoted as the largest tennis academy in the world. The center court featured a retractable roof and provided seating for 7,500 people. Two other clay show courts raised available seating to 9,500. The tournament was discontinued in 2018.