The 14th Regiment Armory, also known as the Eighth Avenue Armory and the Park Slope Armory, is a historic National Guard armory building located in the South Slope neighborhood of Brooklyn, New York City. It is a brick and stone castle-like structure completed in 1893, and designed to be reminiscent of medieval military structures in Europe. It was designed by William Mundell and originally built for the 14th Regiment of the New York State Militia. The Armory was listed on the National Register of Historic Places in 1994, and was designated a New York City landmark in 1998.