The Adventure-class ship was a class of eight 44-gun sailing two-decker warships of the Royal Navy, classed as a fifth rate like a frigate, but carrying two complete decks of guns, a lower battery of 18-pounders and an upper battery of 12-pounders.
The design saw a slight increase in breadth over the Roebuck class, but was otherwise very similar.
Like the Roebuck class, the Adventure class were not counted by the Admiralty as frigates; although sea officers sometimes casually described them and other small two-deckers as frigates, the Admiralty officially never referred to them as such.
The Adventure-class ships were two-deckers with complete batteries on both decks, and hence not frigates.
Eight ships were ordered during 1782 and completed to this design, although none were ready to take part in the American War of Independence.