Four ships of the British Royal Navy have been named HMS Caesar, after the Roman general and dictator Julius Caesar.

• Caesar was ordered as a 74-gun third rate from Plymouth Dockyard in 1777, but construction was cancelled in 1783.
• HMS Caesar (1793) was an 80-gun third rate launched in 1793, used as an army depot after 1814, and broken up 1821.
• HMS Caesar (1853) was a 90-gun screw-propelled second rate launched in 1853 and sold in 1870.
• HMS Caesar (1896) was a Majestic-class battleship launched in 1896 and sold 1921.
• HMS Caesar (R07) was a C-class destroyer launched in 1944 and broken up in 1967.