The Philadelphia Orchestra is a symphony orchestra based in Philadelphia, Pennsylvania, in the United States. One of the "Big Five" American orchestras, it was formed by Fritz Scheel in 1900. The orchestra is based at the Kimmel Center for the Performing Arts, where it performs its subscription concerts, numbering over 130, in Verizon Hall.

Since Scheel's death, the orchestra has had eight music directors and one chief conductor, including Charles Dutoit, Wolfgang Sawallisch, Leopold Stokowski, Eugene Ormandy and Christoph Eschenbach; as of 2013, the incumbent is Yannick Nézet-Séguin.