Orion is the name of various ships and a ship class:

Naval BAE Orion, Ecuadorian Navy ship, originally , Royal French Navy ship of the line , a Nazi German auxiliary cruiser , Royal Australian Navy submarine , various British Royal Navy ships , British Royal Navy battleship class , Royal Swedish Navy ships , various US Navy ships

Civilian , an Arctic ice-strengthened cargo ship (also known as MS Orion, MY Orion), a National Geographic exploration ship MV Orion, a Greek ro-ro freight ferry, previously Pentland Ferries' Orcadia and Caledonian MacBrayne's Saturn Orion, a heavy lift vessel (HLV) operated by DEME Offshore, a subsidiary of the DEME Group. Orion (1904 ship) , a British ferry which sank in 1850 , an Orient Steam Navigation modified , a Swedish salvage ship and museum ship , renamed Orion by 1919

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