Orion is the name of various ships and a ship class:
NavalHSwMS Orion (A201), Royal Swedish Navy signals intelligence shipHMAS Orion (S 61), Royal Australian Navy submarineHMS Orion, various British Royal Navy shipsOrion-class battleship, British Royal Navy ship classUSS Orion, various U.S. Navy shipsBAE Orion (H-101), Ecuadorian Navy ship, originally USS Mulberry (AN-27)German auxiliary cruiser Orion (HSK-1), Nazi Germany naval shipFrench ship Orion (1787), Royal French Navy ship of the lineCivilianSS Orion, Swedish salvage ship and museum shipMV Orion (also: MS Orion, MY Orion) National Geographic exploration shipMS Nordic Orion, Arctic ice-strengthened cargo shipRMS Orion, Orient Steam Navigation modified Orama-class ocean linerOrion (paddle steamer), a British ferry which sank in 1850