A quarter gallery is an architectural feature of the stern of a sailing ship from around the 16th to the 19th century. Quarter galleries are a kind of balcony, typically placed on the sides of the sterncastle, the high, tower-like structure at the back of a ship that housed the officer's quarters. They functioned primarily as latrines for the ship's officers, and in inclement weather they also afforded those officers a view of the forward sails of the ship without having to go outside.^[1] On certain vessels and under certain conditions, the quarter galleries could serve as a firing platform for the ship's marines and sharpshooters during boarding actions. The galleries also provided a structure that was ideally suited for attaching decoration and often bore carved wooden sculptures, particularly in the 17th century.

As small, wing-like extensions of the stern, the quarter galleries were difficult to secure to the hull and in rough weather were sometimes torn from it completely.^[2] Quarter galleries were only fitted on vessels of war.^[3]