A ghillie, or yowie suit is a type of camouflage clothing designed to resemble heavy underbrush. Typically, it is a net or cloth garment covered in loose strips of cloth or twine, sometimes even made to look like leaves and twigs. Snipers and hunters with extreme requirements for going undetected in wilderness areas use a ghillie suit to blend into the brush.

The ghillie suit was developed by Scottish gamekeepers as a portable hunting blind. The name derives from ghillie, the Scots Gaelic for "boy", in English especially used to refer to servants assisting in hunting or fishing expeditions. A ghillie dhu is a type of tree spirit that is supposed to disguise itself in leaves and vegetation.