List of ships of Serco Marine Services

List of ships of Serco Marine Services is a list of active ships operated by Serco Marine Services in support of His Majesty's Naval Service (incl. Royal Navy, Royal Marines and the Royal Fleet Auxiliary). As of 2021, Marine Services operates nearly 100 vessels at six locations in the U.K. at: Portsmouth, Devonport, Falmouth, Clyde and two at Inner Raasay Sound.

Vessels of the Marine Service range in length from 11 m to 93 m and displace from 12 to 3,600 gross tonnes. Serco employs some 600 to 650 mariners and engineers.

The ships Kingdom of Fife and Cameron are provided by Briggs Marine who won a £100M subcontract from Serco Marine Services for the support and maintenance of the Royal Navy's navigational marks (or buoys) and moorings in the United Kingdom and overseas.

In 2022, a £200m contract with Serco was signed extending the arrangement for a further 27 months commencing in December 2022. Under the arrangement, the Ministry of Defence has the option to extend that contract for up to six more months.

As of 2021, principal marine services in the Falkland Islands were provided by the contracted Netherlands Marine Services company Van Wijngaarden, while in Gibraltar, marine services were provided by the vessels of Resolve Marine Group. Resolve acquired T.P. Towage in 2015 and its vessels provide all harbour towage and other support services in and around the Port of Gibraltar.

List of ships
(Diving support/offshore supply vessels; entered service 1989; based at Kyle of Lochalsh ) (Class of two Azimuth Stern Drive Tugs, entered service in 1993; both based at Faslane) (Class of two harbour Tugs with four-man crews; entered service 2009; both based at Portsmouth) (Class of four Tugs; entered service 2009-2010; Bountiful based at Portsmouth; others at Faslane) (Class of five Tugs; entered service 1980-1985; all based at Devonport) (Class of three Tugs; entered service 2009; Jupiter based at Faslane; Hercules and Mars at Devonport ) (Class of Four Tugs; entered service 2010; Deborah and Eileen based at Devonport; Christina and Suzanne at Portsmouth) (Class of two Offshore Supply Ships; entered service 1997; both based at Devonport ) (Class of three passenger vessels; entered service 2000-2001; Newhaven based at Devonport; Nutbourne and Netley at Portsmouth ) (Class of three naval auxiliary vessels; entered service 2000; Oban based at Devonport; Oronsay and Omagh at Faslane )
 * Worldwide support ship
 * SD Victoria based at Portsmouth (Global support ship; reportedly employed for special forces operations)
 * Multi-purpose ship
 * SD Northern River (Offshore supply ship; reportedly employed for special forces operations and other duties including data gathering and submarine support)
 * Moor-class diving support vessels
 * SD Moorfowl
 * SD Moorhen
 * Multicat 2510-class recovery vessels
 * SD Navigator (Recovery vessel; entered service 2009; based at Portsmouth )
 * SD Raasay (Recovery vessel; entered service 2009; based at Kyle of Lochalsh )
 * Multicat 2613-class utility boat
 * SD Angeline (Utility vessel; entered service 2015; based at Faslane )
 * Recovery vessels
 * SD Inspector (Utility vessel; entered service 2001; based at Portsmouth )
 * SD Engineer (Work vessel; entered service 1996; based at Devonport )
 * Coastal oilers
 * SD Teesdale (Oil products tanker; entered service 1976; based at Portsmouth )
 * SD Oilman (Oil barge; entered service 2009; based at Faslane
 * SD Waterpress (Tank barge; entered service 2010; based at Faslane )
 * SD Oceanspray (Tank barge; entered service 2010; based at Portsmouth )
 * Damen ART 80-32 tug
 * SD Tempest (Based at Portsmouth, designated tug for Queen Elizabeth Class Aircraft Carriers)
 * Impulse-class tugs
 * SD Impulse
 * SD Impetus
 * ASD 2509-class tugs
 * SD Independent
 * SD Indulgent
 * ATD 2909-class tugs
 * SD Reliable
 * SD Bountiful
 * SD Resourceful
 * SD Dependable
 * Twin Unit Tractor Tugs
 * SD Adept
 * SD Careful
 * SD Faithful
 * SD Forceful
 * SD Powerful
 * STAN 2608-class tugs
 * SD Hercules
 * SD Jupiter
 * SD Mars
 * ASD 2009-class tugs
 * SD Christina
 * SD Deborah
 * SD Eileen
 * SD Suzanne
 * Felicity-class water tractors
 * SD Florence (Tug; based at Devonport)
 * SD Genevieve (Tug; Entered service 1980; based at Portsmouth)
 * Pushy Cat 1204-class tugs
 * SD Catherine (Tug; entered service 2009; based at Portsmouth )
 * SD Emily (Tug; entered service 2008; based at Devonport )
 * STAN 1405-class tug
 * SD Tilly (Tug; entered service 2008; based at Devonport )
 * Trials vessels
 * SD Warden (Mooring vessel; entered service 1989; experimental and trials support role; based at Kyle of Lochalsh)
 * SD Kyle of Lochalsh (Tug; entered service 1997; based at Kyle of Lochalsh)
 * Storm-class tenders
 * SD Bovisand
 * SD Cawsand
 * Newhaven-class tenders
 * SD Newhaven
 * SD Nutbourne
 * SD Netley
 * Padstow-class tender
 * SD Padstow (Passenger vessel; entered service 2000; based at Devonport )
 * Oban-class tenders
 * SD Oban
 * SD Oronsay
 * SD Omagh
 * Personnel ferries
 * SD Norton Based at Portsmouth
 * SD Eva Based at Faslane
 * Fleet tenders
 * SD Melton Based at Kyle of Lochalsh
 * SD Menai Based at Falmouth
 * SD Meon Based at Falmouth
 * STAN 1505-class tenders
 * SD Clyde Racer Based at Faslane
 * SD Solent Racer Based at Portsmouth
 * SD Tamar Racer Based at Devonport
 * STAN 1905-class tenders
 * SD Clyde Spirit Based at Faslane
 * SD Solent Spirit Based at Portsmouth
 * SD Tamar Spirit Based at Devonport