Valhalla is a hamlet and census-designated place located within the town of Mount Pleasant, in Westchester County, New York, United States, in the New York City metropolitan area. Its population was 3,162 at the 2010 U.S. Census. The name of the community was inspired by a fan of the opera composer Richard Wagner, and the hamlet is known both for its location as the home of the primary hospital campus of Westchester Medical Center and New York Medical College, as well as the burial place of numerous noted people. The name comes from Valhalla, a heavenly abode in Norse mythology.