Two ships of the Royal Navy have borne the name HMS Royal William
HMS Royal William was a 100-gun first rate launched in 1670 as HMS Prince. She was rebuilt in 1692 and renamed HMS Royal William, rebuilt again in 1719, and rearmed to 84 guns and fitted as a guardship in 1790. She was broken up in 1813.
HMS Royal William was a 120-gun first rate launched in 1833. She was fitted with screw propulsion and rearmed to 72 guns in 1860, and became a training ship named Clarence in 1885. She was burnt by accident in 1899.
