A poultice, also called a cataplasm, is a soft moist mass, often heated and medicated, that is spread on cloth and placed over the skin to treat an aching, inflamed or painful part of the body. It can be used on wounds such as cuts.

'Poultice' may also refer to a porous solid filled with solvent used to remove stains from porous stone such as marble or granite.

The word "poultice" comes from the Greek word "poltos" transformed in the Latin puls, pultes, meaning "porridge".