Provided are a polarizer and a display device including a polarizer. The polarizer comprises: a base; a wire grid pattern layer disposed on the base and including wire patterns extending in a first direction and spaced apart from each other in a second direction intersecting the first direction; and a capping layer which is disposed on the wire grid pattern layer and comprises a first inorganic capping layer containing an inorganic material and an organic capping layer containing an organic material, wherein the first inorganic capping layer comprises inorganic capping patterns which are disposed on the wire grid pattern layer, extend in the first direction and are spaced apart from each other in the second direction and being disposed at positions corresponding to the wire patterns, and at least a portion of the organic capping layer is inserted into a space between adjacent inorganic capping patterns.