Upper Darby Township (often shortened to simply Upper Darby) is a home rule township bordering West Philadelphia in Delaware County, Pennsylvania, United States.

Upper Darby is also home to the Tower Theater, a historic music venue on 69th Street built in the 1920s. Upper Darby's population is diverse, representing over 100 ethnic cultures. The township hosts a range of housing types including densely populated rowhouse sections, tree-lined neighborhoods of turn-of-the-century single-family houses and mid-century developments.

It is Pennsylvania's sixth most populous municipality. Located just 2.8 miles from Center City (downtown Philadelphia), and houses the western terminus of the Market-Frankford Line of the SEPTA mass transit system of Philadelphia, with the location at 69th Street in the heart of Upper Darby's principal business district. Multiple trolley and bus lines connect the 69th Street Terminal to all major SEPTA lines of Delaware and Montgomery counties as well as Philadelphia.

Upper Darby is 65% residential, 25% commercial, and 8% other. As of the 2010 census, the township had a total population of 82,795. Because of a home-rule charter adopted in 1974 and effective in 1976, Upper Darby utilizes a mayor-council form of management, unlike communities that are still under the Pennsylvania Township Code. ("First Class" townships in Pennsylvania have a board of commissioners divided into wards, and "Second Class" townships having a board of supervisors, which are usually elected "at-large".)

Transportation

SEPTA's 69th Street Transportation Center is located in Terminal Square on 69th Street. It serves as the western terminal stop of the Market-Frankford Line, the eastern terminal stop of the Norristown High Speed Line (formerly Route 100) and SEPTA trolley routes 101 and 102, as well as SEPTA Bus Routes 21, 30, 65, 68, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 120, 123, and 126. The Norristown High Speed Line has stops in Upper Darby at 69th Street and Parkview Station.

Pennsylvania Route 3, which links Philadelphia and West Chester passes through Upper Darby as Market Street and the West Chester Pike.