The Erlanger Theatre was a live-performance theater at the northwest corner of 21st and Market Streets in Philadelphia, Pennsylvania.

The Erlanger, which opened on October 23, 1927, with the musical show Criss Cross, was equipped to facilitate multiple venues for both live theater and motion pictures.

[1] It was constructed to replace the entertainment gap left by the original Forrest Theatre (demolished in 1927) that was located about 20 blocks southeast on South Broad Street.

The interior design theme consisted of elaborated decorations, furnished with imported marble, gold leaf, murals, tapestries, crystal chandeliers, crystal mirrors, antique woodwork, hand-wrought ironwork, and elaborate Napoleonic French-inspired furniture.

However, the Erlanger was most famous for pre-Broadway musical stage shows such as Guys and Dolls, West Side Story, Man of La Mancha, My Fair Lady and other productions.