Philadelphia Seaplane Base (IATA: PSQ, FAA LID: 9N2) is a township-owned, public-use seaplane base located one nautical mile (1.85 km) south of the central business district of Essington, a community in Tinicum Township, Delaware County, Pennsylvania, United States. It is situated on the Delaware River, west of Philadelphia International Airport.

Originally, the facility operated during World War I as Chandler Field.