redan

thumb|right|A redan as part of a fortification thumb|Saint Anthony's Battery in Qala, [[Malta, with a redan containing the entrance]] thumb| "Cascalho" Redan in the city walls of Elvas, [[Portugal]]

Redan (a French word for "projection", "salient") is a feature of fortifications. It is a work in a V-shaped salient angle towards an expected attack. It can be made from earthworks or other material.