White Oak is a borough in Allegheny County, Pennsylvania, United States. The population was 7,630 at the 2020 census. It is a suburb of the Pittsburgh metropolitan area. White Oak was named for a stand of white oak trees near the original town site.

White Oak was originally part of Versailles Township (one of the original townships of Allegheny County). It wasn't until March 21, 1948, that a petition requesting the formation of White Oak Borough was submitted to the County Court. On June 24, 1948, Judge Russell H. Adams signed the decree of incorporation of the new borough. The first borough building was located at 860 Maple Street inside the old Bowery School.

White Oak has five borders, including North Versailles Township to the north, North Huntingdon Township in Westmoreland County to the east, South Versailles Township to the southwest, Elizabeth Township to the south (in which a short part of the border runs across the Youghiogheny River), and McKeesport to the west.

The area offers a robust educational infrastructure, with several reputed schools serving the borough. These include Francis McClure Middle School, Twin Rivers Intermediate School, Founders’ Hall Middle School, and McKeesport Area High School. Additionally, Mary of Nazareth Catholic School provides an option for those seeking Catholic education.