Forecastle

Replica of the Victoria, the only one of Ferdinand Magellan's five ships to return to Spain in 1522, showing its forecastle (left/foremost), quarterdeck (middle right), and poop deck (far right/aftmost).

The forecastle (/ˈfoʊksəl/ ⓘ FOHK-səl; contracted as fo'c'sle or fo'c's'le) is the upper deck of a sailing ship forward of the foremast, or, historically, the forward part of a ship with the sailors' living quarters. Related to its latter meaning is the phrase "before the mast", which denotes anything related to ordinary sailors, as opposed to a ship's officers.