Five ships (and one submarine under construction) of the Royal Navy have been named HMS Agamemnon, after the legendary Greek king Agamemnon.

• HMS Agamemnon (1781) was a 64-gun third-rate launched in 1781. She took part in the Battle of Trafalgar in 1805 and was wrecked in 1809.
• HMS Agamemnon (1852) was a 91-gun screw-propelled second-rate launched in 1852 and sold in 1870.
• HMS Agamemnon (1879) was an Ajax-class battleship launched in 1879 and broken up in 1903.
• HMS Agamemnon (1906) was a Lord Nelson-class battleship launched in 1906, used as a target ship from 1920 and sold in 1927.
• HMS Agamemnon (M10) MV Agamemnon was requisitioned as an auxiliary minelayer for the Northern Barrage in 1940 and returned in 1946.
• HMS Agamemnon (S124) is an Astute-class nuclear submarine currently under construction.

Battle honours

• Ushant 1781
• The Saints 1782
• Genoa 1795
• Copenhagen 1801
• Trafalgar 1805
• San Domingo 1806
• Crimea 1854–55
• Dardanelles 1915–16