The 2015 Western & Southern Open was a men's and women's tennis tournament played on outdoor hard courts August 15–23, 2015. It was part of the ATP World Tour Masters 1000 of the 2015 ATP World Tour and of the WTA Premier 5 tournaments of the 2015 WTA Tour, as well as a 2015 US Open Series event. The 2015 tournament was the men's 114th edition and the women's 87th edition of the Cincinnati Masters.