aftercastle

thumb|Aftercastle of the frigate French frigate Méduse (1810)|Méduse, as seen from the deck thumb|Galleon showing both a [[forecastle (left) and aftercastle (right)]] thumb|upright|Stern of a replica 17th-century galleon The aftercastle (or sterncastle, sometimes aftcastle) is the stern structure behind the mizzenmast and above the transom on large sailing ships, such as carracks, caravels, galleons and galleasses. It usually houses the captain's cabin and perhaps additional cabins and is crowned by the poop deck, which on men-of-war provided a heightened platform from which to fire upon other ships; it was also a place of defence in the event of boarding. More common, but much smaller, is the forecastle.

The corresponding term forecastle today is also used to describe the upper deck of a sailing ship forward of the foremast in general.