Four ships of the Royal Navy have carried the name HMS Crocus, after the crocus, a genus of flowering plants.
- was a 14-gun sloop launched in 1808 and sold in 1815.
- was a wooden screw gunboat launched in 1856 and broken up in 1864.
- was an minesweeping sloop launched in 1915 and sold in 1930.
- was a launched in 1940 and sold into civilian service in 1946 under the name Annlock.