Four ships of the Royal Navy have borne the name HMS Euphrates, after the Euphrates river. Another three were planned but never completed:
HMS Euphrates was a 36-gun fifth rate built as HMS Greyhound, but renamed in 1812 and launched in 1813. She was sold in 1818.
HMS Euphrates was to have been a 46-gun fifth rate. She was laid down, but cancelled in 1831.
HMS Euphrates was a 10-gun brig launched in 1828.
HMS Euphrates was a paddle gunboat built in Britain and re-erected on the Tigris in 1834. Her fate is unknown.
HMS Euphrates was to have been a wooden screw frigate, laid down in 1847 and cancelled in 1849.
HMS Euphrates was an iron screw troopship launched in 1866 and sold in 1894.
HMS Euphrates was to have been an Emerald-class light cruiser, laid down in 1918 and cancelled in 1919.
