HMS Orion

{{Use dmy dates|date=February 2025}}

{{Use British English|date=December 2016}}

Seven ships of the British Royal Navy have been named HMS Orion, after the hunter Orion of Greek mythology:

• {{HMS|Orion|1787}} was a 74-gun third-rate ship of the line launched in 1787 and broken up in 1814.
• {{HMS|Orion|1854}} was an 80-gun second-rate screw ship launched in 1854 and broken up in 1867.
• {{HMS|Orion|1879}} was an armoured corvette built for the Ottoman Empire but purchased by the Royal Navy in 1878 and launched in 1879. She was converted to a depot ship and renamed HMS Orontes in 1909, and was sold in 1913.
• HMS Orion was to have been an armoured cruiser. She was projected in 1904 but never built.
• {{HMS|Orion|1910}} was an {{sclass|Orion|battleship}} launched in 1910 and sold in 1922.
• {{HMS|Orion|85}} was a {{sclass|Leander|cruiser (1931)|0}} light cruiser launched in 1932 and sold in 1949.
• Orion was a French submarine seized in 1940, laid up until 1943 and then broken up.