Dieppe was a steamship which was built in 1905 for the London, Brighton and South Coast Railway. She was requisitioned during the First World War for use as a troopship and later as a hospital ship HMS Dieppe, returning to her owners postwar. She passed to the Southern Railway on 1 January 1923. In 1933, she was sold to W E Guinness and converted to a private yacht, Rosaura. She was requisitioned during the Second World War for use as an armed boarding vessel, HMS Rosaura. She struck a mine and sank off Tobruk, Libya on 18 March 1941.