Dō-maru (胴丸), or "body wrap", is a type of chest armour (dou or dō) that was worn by the samurai class of feudal Japan.

The ō-yoroi is a heavy, box-like type of armour meant for use on horseback, and was expensive to make.

The dō-maru, like the haramaki, has more skirt plates (kusazuri) than an ō-yoroi and is lighter, closer-fitting, and cheaper to create.

The dō-maru was easier to fight with on foot and eventually even higher status samurai adopted it over the ō-yoroi.

Due to the weight of iron, armour makers limited its use to the most vital parts of the armor and used leather for the remainder.