Huntington Ingalls Industries (HII) is an American Fortune 500 shipbuilding company formed on March 31, 2011 as a spin-off of Northrop Grumman.

Mike Petters is currently the president and CEO of Huntington Ingalls Industries (formerly president of the Newport News shipyard and president of the Northrop Grumman Shipbuilding).

HII is the sole designer, builder, and refueler of nuclear-powered aircraft carriers in the United States. It is one of two nuclear-powered submarine builders (the other being General Dynamics Electric Boat). 70% of the current, active US Navy fleet has been built by HII's erstwhile units.

Huntington Ingalls Industries was formerly known as Northrop Grumman Shipbuilding (NGSB), created on January 28, 2008 by the merger of Northrop Grumman's two shipbuilding sectors, Northrop Grumman Ship Systems and Northrop Grumman Newport News. The company takes its name from the founders of its two main facilities: Collis Potter Huntington (Newport News) and Robert Ingalls (Pascagoula).

HII operates facilities in several key locations across the US:

HII's 2016 order backlog amounts to $20.5 billion.

HII is to build ten Gerald R. Ford-class aircraft carriers for the US Navy. It is scheduled to deliver one carrier every five years starting in 2015.

The US Navy awarded HII a $2.4 billion fixed-price incentive contract for the detail design and construction of the amphibious assault ship America (LHA-6), the lead ship of her class. Work will be performed primarily at the company's shipyard in Pascagoula, Miss., and ship delivery is scheduled for 2012.

In June, 2016 Huntington Ingalls Industries has been awarded a $273 million contract to build the U.S. Navy’s newest amphibious assault warship, according to a company press release. The total contract value for the construction of the third America-class ship is over $3 billion. This contract included planning, advanced engineering and procurement of long-lead material for the new vessel.

In April 2011, the US Navy awarded HII a $1.5 billion contract for the construction of John P. Murtha (LPD-26), the tenth of the San Antonio-class amphibious transport docks. This was the first Navy contract awarded to HII, though Ingalls Shipbuilding had already built three ships of the class.

The US Navy is building Virginia-class submarines as replacements for the Los Angeles-class submarines which are currently being phased out.

HII, under an industrial arrangement with General Dynamics Electric Boat (the only other shipyard capable of building nuclear-powered submarines), solely builds the stern, habitability and machinery spaces, torpedo room, sail and bow, while Electric Boat solely builds the engine room and control room. HII and Electric Boat alternate work on the reactor plant, final assembly, test, outfit and delivery.

In 2014 The Government Accountability Office denied a contract appeal by Ingalls for the US Coast Guard's Offshore Patrol Cutter program, finding that the USCG's ranking of the shipyard to be marginal was justified.