Olean Armory is a historic armory building located at Olean in Cattaraugus County, New York. It was designed by State architects Isaac G. Perry (1890 structure) and Lewis Pilcher (1919 structure). It consists of a two-story, Tudor inspired administration building constructed in 1919, with an attached Romanesque drill shed constructed in 1890. The building features a number of castellated style features such as turrets and buttresses. It was listed on the National Register of Historic Places in 1995.