BAE Systems Maritime – Maritime Services is a wholly owned subsidiary company of BAE Systems, specialising in the repair and maintenance of Royal Navy vessels, as well as product development, naval training and through life support for radar, torpedoes and small boats.

Maritime Services was originally formed as Fleet Support Limited (FSL), a joint venture between GEC-Marconi and Vosper Thornycroft (now VT Group).

In July 2008 BAE Systems and VT Group merged their military ship repair businesses to form BVT Surface Fleet.

[4][5] Maritime Services carries out advanced manufacturing operations at Broad Oak in Portsmouth, Cowes on the Isle of Wight, Great Baddow in Essex and Hillend in Fife.

[10] In November 2017, Maritime Services was awarded a five-year, £18m contract to support the long-range radar equipment on the UK's six Type 45 destroyers.

[19] Maritime Services is part of an alliance with Cammell Laird and consultancy firm BMT that is contracted to resolve ongoing Type 45 power generation issues caused by unreliable Northrop Grumman intercoolers.