Blue Castle

Blue Castle may refer to:


 * The Blue Castle, a 1926 novel by Lucy Maud Montgomery
 * Blue Castle, a nickname for the Washington and Georgetown Railroad Car House in Washington, D.C., United States
 * Blue Castle Games, the former name of Capcom Vancouver, a video game developer in Burnaby, British Columbia, Canada
 * Blue Castle Project, a proposed nuclear power plant near Green River, Utah, United States