The Southeastern Pennsylvania Transportation Authority (SEPTA) is a regional public authority that operates various forms of public transit — bus, subway and elevated rail, regional rail, light rail, and electric trolley bus — that serve 3.8 million people in and around Philadelphia, Pennsylvania. SEPTA also manages construction projects that repair, replace, and expand infrastructure and rolling stock. SEPTA serves the combined city and county of Philadelphia, Delaware County, Montgomery County, Bucks County, and Chester County.

SEPTA also serves New Castle County in Delaware, and Mercer County in New Jersey. SEPTA has the 6th-largest U.S. transit system by ridership, with about 306.9 million annual unlinked trips. It controls 280 active stations, over 450 miles of track, 2,295 revenue vehicles, and 196 routes.

SEPTA also manages Shared-Ride services in Philadelphia and ADA services across the region. These services are operated by third-party contractors. SEPTA is one of only two U.S. transit agencies that operate all of the five major types of transit vehicles: regional (commuter) rail trains, "heavy" rapid transit (subway/elevated) trains, light rail vehicles (trolleys), electric trolleybuses and motor buses.

The other is Boston's Massachusetts Bay Transportation Authority (which runs ferryboat service as well).

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