全帆装船（英文作Full rigged ship）是有三根或以上桅杆，全部桅杆均挂横帆的帆船。

典型的全帆装船一般是三桅，也有四桅、五桅的情况（很罕见。一般超过四桅的帆船会采用最后桅纵帆的帆装，见多桅帆船，而不是全横帆的帆装。）。所有桅杆上均挂横帆，之间一般有支索帆。从船头到船尾，这些桅杆分别称为：

右图为方帆名称示意图，从下往上分别为：

注意与普通三桅帆船的区别。后者对应英文中barque，一般指最后一根桅杆上挂纵帆，其他所有桅杆均为横帆的帆船。前桅横帆三桅船则是除了前桅横帆其他桅杆都挂纵帆。

全帆装船船身大，全横帆帆装在各种风向情况下都有很好的速度，但是由于帆索控制复杂需要较多人手，故商用和民用船中以后桅纵帆的普通三桅帆船居多。但是作为战船全帆装船则是风帆时代的首选。标准风帆战列舰均为全帆帆装。

A full-rigged ship or fully rigged ship is a sailing vessel with three or more masts, all of them square-rigged. A full-rigged ship is said to have a ship rig or be ship-rigged.

Sometimes such a vessel will merely be called a ship in 18th- to early-19th-century and earlier usage, to distinguish it from other vessels such as schooners, barques, barquentines, brigs, etc. Alternatively, a full-rigged ship may be referred to by its function instead, as in collier or frigate, rather than being called a ship. In many languages the word frigate or frigate rig refers to a full-rigged ship.