Twelve ships of the Royal Navy have borne the name HMS Thetis, named after the sea-nymph in Greek mythology:

• The first Thetis was a 22-gun storeship launched in 1717.
• The second Thetis was a 44-gun fifth-rate launched in 1747 and sold in 1767.
• The third Thetis was a 32-gun fifth-gun launched in 1773 and wrecked off St Lucia in 1781.
• The fourth Thetis was a 38-gun fifth-rate launched in 1782 and sold in 1814.
• The fifth Thetis was a 24-gun sixth-rate launched in 1796.
• The sixth Thetis was an 8-gun schooner purchased in 1796.
• The seventh Thetis was a 10-gun gun-brig launched in 1810.
• The eighth Thetis was a 46-gun fifth-rate launched in 1817 and wrecked off Cape Frio in 1830.
• The ninth Thetis was a 36-gun fifth-rate launched in 1846 and transferred to Prussia in 1855.
• The tenth Thetis was a Briton-class wooden screw corvette, launched in 1871 and sold in 1887.
• The eleventh Thetis, launched in 1890, was an Apollo-class second class protected cruiser. She was sunk in 1918 as a blockship at Zeebrugge.
• The twelfth Thetis (N25), launched in 1938, was a T-class submarine. She sank during trials but was salvaged and recommissioned as Thunderbolt. She was sunk on 14 March 1943 north of Sicily by the Italian corvette Cicogna .

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