Navantia UK is a UK subsidiary of Spanish state-owned Navantia SA, specializing in naval shipbuilding, defence systems, and maritime engineering. It acquired Harland & Wolff in January 2025, operating shipyards in Belfast, Appledore, Methil, and Arnish, and serves as prime contractor for the £1.6 billion Fleet Solid Support programme to build three vessels for the Royal Fleet Auxiliary. The company supports UK defence, security, and energy sectors with a workforce exceeding 1,100 employees.