Leśni (short for , Polish for the men from the forests) is one of the informal names applied to the anti-German partisan groups operating in occupied Poland during World War II. The groups were formed mostly by people who for various reasons could not operate from settlements they lived in and had to retreat to the forests. Contrary to most of the organised groups of resistance, with the Armia Krajowa being the most notable, the forest people formed a sort of a standing army as opposed to regular partisan units that gathered shortly before an action and then retreated to their homes.