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CoreStates Financial Corp was a bank Holding Company in the Philadelphia, Pennsylvania, metropolitan area. The bank was originally founded in 1803 as the Philadelphia National Bank or PNB. PNB acquired Hamilton Bank of central Pennsylvania, and later New Jersey National Bank, headquartered in Trenton, NJ in the mid-1980s. During the time of the Hamilton merger the holding company, Corestates was formed. Corestates Bank of Delaware was also part of the regional powerhouse. In 1990, CoreStates acquired crosstown rival First Pennsylvania Bank. In a controversial deal announced a few days prior to the announcement of staff reductions and branch closings with regard to the First Pennsylvania merger, Corestates signed a $20 Million Dollar naming rights and marketing package with Spectacor for the new arena, being built next to the old Philadelphia Spectrum (later known as the CoreStates Spectrum), to be known as the CoreStates Center. In 1996, CoreStates would acquire another regional rival, Meridian Bank, their largest acquisition to date. CoreStates was then acquired by First Union in 1998. The CoreStates-First Union merger was the largest US bank merger at the time and has been criticized as one of the most poorly executed bank mergers in history. First Union bought Wachovia in 2001 to form the nation's fifth largest bank holding company. Because of negative associations with the First Union name, it was dropped in favor of Wachovia Corporation.

The company's original headquarters building is located at the corner of Broad and Chestnut Streets in Center City Philadelphia.

CoreStates/Philadelphia National Bank was a pioneer in electronic banking, forming MAC, a strategic venture in shared ATM networks in the 1970s.