HMS Sedgemoor was a 50-gun fourth rate ship of the line of the English Royal Navy, launched at Chatham Dockyard in May 1687.

[2] She was named to commemorate the King's victory over the Monmouth Rebellion at the Battle of Sedgemoor in July 1685.

One of only three 50-gun ships to be built during James II's brief reign (all three completed with an unusual "square tuck" stern), she was first commissioned on 5 May 1687 under Captain David Lloyd, who was still in command (although actually ashore in Dover) when she was wrecked twenty months later.

All three ships ordered in 1682/3 (all were launched in 1687) were intended to carry 54 guns each - twenty-two 24-pounders on the lower deck, the same number of demi-culverins (9-pounders) on the upper deck, and ten demi-culverin drakes on the quarterdeck.

The Sedgemoor was driven ashore and wrecked at South Foreland, in St Margaret's Bay, Dover, Kent on 2 January 1689.