Nine ships of the Royal Navy have been named HMS Rainbow, after the rainbow, a common meteorological phenomenon:
English ship Rainbow (1586) was a 26-gun galleon launched in 1586. She was rebuilt in 1602, and again in 1617 to carry 40 guns. She was reconstructed about 1630 as a second rate of 54 guns. She was sunk as a breakwater in 1680.
HMS Rainbow (1747) was a 44-gun fifth rate launched in 1747. She was used as a troopship from 1776, then equipped experimentally with carronades she captured the French frigate Hébé off the coast of Brittany in 1782, was on harbour service from 1784 and was sold in 1802.