RFA Argus is a ship of the Royal Fleet Auxiliary operated by the Ministry of Defence under the Blue Ensign. Italian-built, Argus was formerly the container ship MV Contender Bezant. The ship was requisitioned in 1982 for service in the Falklands War and purchased outright in 1984 for a four-year conversion to an Aviation Training Ship, replacing RFA Engadine. In 1991, during the Gulf War, she was fitted with an extensive and fully functional hospital to assume the additional role of Primary Casualty Receiving Ship. In 2009, the PCRS role became the ship's primary function. Argus is due to remain in service beyond 2030. In July 2022 it was reported that the future Littoral Strike Role would be assumed by Argus after a refit to convert her to this role.

As the ship is armed and is not painted in the required white with red crosses, the Geneva Convention prevents her from being officially classified as a hospital ship. The ship's capabilities make her ideally suited to the humanitarian aid role and she has undertaken several of these missions. The Royal Navy has occasionally described her as a "support ship/helicopter carrier".