The 2026 Cincinnati Open was the 125th men's edition of the tournament.
The event's history dates to the late 19th century, making Cincinnati one of the oldest continuously staged tennis tournaments in the world. The 2026 competition was played from 13 to 23 August at the Lindner Family Tennis Center in Mason, Ohio, a northern suburb of Cincinnati.
The same combined event was also the 98th women's edition, so the two historical counts are not interchangeable. In 2026, the men's competition was classified as an ATP Tour Masters 1000 event, while the women's competition was a WTA 1000 tournament. Both portions were played outdoors on hard courts, but they had separate draws, ranking-point structures and prize-money tables.