HMS Unseen

Two submarines of the Royal Navy have been named HMS Unseen


 * HMS Unseen was a Second World War U-class submarine launched on 16 April 1942 and later served in the Mediterranean, being broken up in 1949.
 * HMS Unseen is the old name of HMCS Victoria, a long-range hunter-killer (SSK) submarine of the Canadian Navy, that was purchased from the Royal Navy in 1998.