The 1975 Cincinnati Open, also known as the Western Championships, was a tennis tournament played on outdoor hard courts at the Coney Island in Cincinnati, Ohio in the United States that was part of the 1975 Commercial Union Assurance Grand Prix. It was the 75th edition of the tournament and was held from July 29 through August 3, 1975. Tom Gorman won the singles title.
Tom Gorman defeated Sherwood Stewart 7–5, 2–6, 6–4
Phil Dent / Cliff Drysdale defeated Marcelo Lara / Joaquín Loyo Mayo 7–6, 6–4