Oakmont Country Club is a country club in Plum and Oakmont, Pennsylvania, United States. Established in 1903, the club predominantly lies in the borough of Plum, in the East Hills suburbs of Pittsburgh. Its golf course is regarded as the "oldest top-ranked golf course in the United States" and was designated a National Historic Landmark in 1987. The Pennsylvania Turnpike separates seven holes (two through eight) from the rest of the layout. Oakmont most recently hosted its record tenth U.S. Open in 2025.