Eastern Shipbuilding Group Inc (ESG) is a vessel construction company.

The company offers Offshore Supply Vessels, Tugs, articulated tug-barges (ATBs), inland towboats, a small waterplane area twin hull (SWATH) vessel, passenger vessels, ro-ro/passenger ferries, inland transport vessels, barges, fireboats, research vessels, offshore construction vessels, dredges, high-speed passenger vessels and fishing vessels.

ESG provides regulatory and detailed production engineering, vessel construction, and the delivery of three new Staten Island Ollis class ferries for the New York City department of transportation.

The company also builds vessels for national defence and commercial clients. The US Coast Guard selected ESG to design and build the offshore patrol cutters (OPC). OPCs serve as a mobile command and control platform for surge operations such as hurricane response, mass migration incidents, and other events.