The 2015 Istanbul Open (also known as the TEB BNP Paribas Istanbul Open for sponsorship purposes) was a men's tennis tournament played on outdoor clay courts.

It was the first edition of the Istanbul Open, and an ATP World Tour 250 event.

It took place at the Koza World of Sports Arena in Istanbul, Turkey, from 27 April through 3 May 2015.

First-seeded Roger Federer won the singles title.

Roger Federer defeated Pablo Cuevas, 6–3, 7–6(13–11) Radu Albot / Dušan Lajović defeated Robert Lindstedt / Jürgen Melzer, 6–4, 7–6(7–2) The following players received wildcards into the main draw: The following players received entry via the qualifying draw: The following pair received wildcards into the doubles main draw: The following pair received entry as alternates: