The Enterprise-class frigates were the final class of 28-gun sailing frigates of the sixth-rate to be produced for the Royal Navy. These twenty-seven vessels were designed in 1770 by John Williams. A first batch of five ships were ordered as part of the programme sparked by the Falklands Islands emergency. Two ships were built by contract in private shipyards, while three others were constructed in the Royal Dockyards using foreign oak.

HMS Fox was a 28-gun Enterprise-class sixth-rate frigate of the Royal Navy. Fox was first commissioned in October 1775 under the command of Captain Patrick Fotheringham. The Americans captured her in June 1777, only to have the British recapture her about a month later. The French then captured her a little less than a year after that, only to lose her to grounding in 1779, some six months later.