Sun Shipbuilding & Drydock Co.

Sun Shipbuilding & Drydock Company (1917–1982) was a major shipbuilding company in Chester, Pennsylvania with a large shipyard on the Delaware River. Originally built to supply tankers for the Sun oil company (Sunoco), it would later build tankers for their US government and other oil companies, before building many different types of ship's over its 70-year history. During World War II, it participated in the U.S. Government's Emergency Shipbuilding Program. At the height of its operation in the Second World War, the Sun campus was the largest shipyard in the world, employing some 40,000 workers.

The company was also part of the U.S. aerospace industry during the Cold War; it built various propulsion research & development structures, including the largest U.S. rocket test chamber, for Aerojet General in 1963.