Comcast Center, also known as the Comcast Tower, is a skyscraper in Center City Philadelphia. The 58-story, 297-meter (974 ft) tower is the second-tallest building in Philadelphia and in the U.S. state of Pennsylvania, and the 31st-tallest building in the United States. Originally called One Pennsylvania Plaza when plans for the building were announced in 2001, the Comcast Center went through two redesigns before construction began in 2005. Comcast Center was designed by Robert A.M. Stern Architects for Liberty Property Trust.

Center City includes the central business district and central neighborhoods of Philadelphia, Pennsylvania, United States. It comprises the area that made up the City of Philadelphia prior to the Act of Consolidation, 1854, which extended the city borders to be coterminous with Philadelphia County.