The Delaware River Iron Ship Building and Engine Works, often referred to by its parent company name of John Roach & Sons, or just known as the Roach shipyard, was a major late–19th-century American shipyard founded in 1871 by John Roach. For the first fifteen years of its existence, the shipyard was by far the largest and most productive in the United States, building more tonnage of ships than its next two major competitors combined, in addition to being the U.S. Navy's largest contractor. The yard specialized in the production of large passenger freighters, but built every kind of vessel from warships to cargo ships, oil tankers, ferries, barges, tugs and yachts.