Several ships of the Royal Navy have been named HMS Euryalus after Euryalus, the character from Greek mythology, one of the Argonauts.

• Euryalus , launched 1803, was a frigate. Captained by Henry Blackwood , she was at the Battle of Trafalgar, where she was Collingwood's flagship after the death of Nelson.
• Euryalus, launched at Chatham in 1853, was a 2,371 ton wooden screw frigate of 35 guns and crew of 515.
• Euryalus , launched in 1877, was a Bacchante-class iron screw corvette, sold in 1897.
• Euryalus , launched 1901, was a Cressy-class armoured cruiser that fought at the Dardanelles in World War I. She was scrapped in 1920.
• Euryalus (42), launched 1939, was a Dido-class cruiser. In World War II she was damaged at the Second Battle of Sirte in 1942.
• Euryalus (F15), launched 1963, was a Leander-class frigate, scapped in 1990.