Old City is a neighborhood in Center City, Philadelphia, Pennsylvania, United States, near the Delaware River waterfront. It is home to Independence National Historical Park, a dense section of historic landmarks including Independence Hall, the Liberty Bell, the First Bank of the United States, the Second Bank of the United States, and Carpenters' Hall. It also includes historic streets such as Elfreth's Alley, dating back to 1703.

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.