Four ships and one shore establishment of the Royal Navy have borne the name HMS Euphrates, after the Euphrates river. Another three were planned but never completed:
HMS Euphrates (1813) 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 to have been a wooden screw frigate, laid down in 1847 and cancelled in 1849.