The Fort Rosalie or Fort class of fleet replenishment vessel of the British Royal Fleet Auxiliary were designed to replenish Royal Navy taskgroups with various armaments and victualling stores while under way. Unlike the bigger Fort Victoria class, they supply dry stores and not fuel. RFA Fort Rosalie was originally known as Fort Grange but was renamed in 2000 to avoid confusion with the new Fort Victoria-class replenishment oiler RFA Fort George. Both ships were withdrawn from service and later sold in 2021.

The Royal Fleet Auxiliary (RFA) is a naval auxiliary fleet owned by the UK's Ministry of Defence. It is a component of His Majesty's Naval Service and provides logistical and operational support to the Royal Navy and Royal Marines. The RFA ensures the Royal Navy is supplied and supported by providing fuel and stores through replenishment at sea, transporting Royal Marines and British Army personnel, providing medical care and transporting equipment and essentials around the world. In addition the RFA acts independently providing humanitarian aid, counter piracy and counter narcotic patrols together with assisting the Royal Navy in preventing conflict and securing international trade. They are a uniformed civilian branch of the Royal Navy staffed by British merchant sailors. The RFA is one of five RN fighting arms.