is a home rule municipality in Allegheny County, Pennsylvania, United States, and is part of the Pittsburgh Metro Area, approximately 8 miles (13 km) southwest of Pittsburgh. The population was 33,556 at the 2000 census, at which time it was a borough.
According to the United States Census Bureau, the borough had a total area of , all of it land. Its average elevation is above sea level. Bethel Park lies at the margin between the Pittsburgh Low Plateau and Waynesburg Hills Sections of the Allegheny Plateau physiographic province. The area is characterized as a maturely dissected region where the ephemeral minor tributaries converge into the tributaries of principal streams.
The highest point in Bethel Park is Rocky Ridge in the southwestern portion of the municipality, , and the lowest point is at the intersection of the Piney Fork and Alsip Run creeks, , in the southeast corner of the municipality.