SEPTA Route 15

Route 15, the Girard Avenue Line, is a trolley line operated by the Southeastern Pennsylvania Transportation Authority (SEPTA) along Girard Avenue through North and West Philadelphia, Pennsylvania, United States. As of 2007, it is the only surface trolley line in the City Transit Division that is not part of the Subway–Surface Trolley Lines (although it is designated as such on SEPTA's rail maps). SEPTA PCC II vehicles are used on the line.

The line was first opened in 1859 as a horse car line operated by the Richmond and Schuylkill River Passenger Railway, and electrified in 1895, with extensions in 1902 and 1903. Service was "bustituted" in 1992, along with Route 23 (Germantown Avenue-11th and 12th Streets) and Route 56 (Torresdale-Erie Avenues). On September 4, 2005, trolley service was restored.

On April 29, 2012, the east of Frankford Ave the line started being operated by buses due to major reconstruction; west of Frankford is still run by PCC II. Trolleys terminated at Frankford and Delaware Avenues (Northern Liberties Loop) while buses terminated at Girard Station under the Market-Frankford Line. As of January 2020, the full line is being substituted by a bus bridge to allow for rolling stock maintenance, track repairs, and a nearby highway expansion. Trolley service was originally anticipated to return in late 2021. As of August 2023, six of the 18 cars have been restored, and SEPTA initially expected that trolleys will be in service in the fall of 2023. However, as of February 12, 2024, the trolleys are now expected to return in the spring of 2024.