Walnut Street is a SEPTA Media–Sharon Hill Line stop in Upper Darby Township, Pennsylvania.

It is officially located at Garrett Road and Walnut Street, but Bywood Avenue is also included as it parallels the north side of the line.

Trolleys arriving at this station travel between 69th Street Transportation Center further east in Upper Darby and either Orange Street in Media, Pennsylvania, for the Route 101 line, or Sharon Hill, Pennsylvania, for the Route 102 line.

Both lines run parallel to Garrett Road and Bywood Avenue on private right-of-way, and Walnut Street is the easternmost stop where the lines run parallel to both streets.

The station is located west of the Upper Darby Township Municipal Library.