Hibiya Park (日比谷公園 Hibiya Kōen) is a park in Chiyoda City, Tokyo, Japan. It covers an area of 161,636.66m2 between the east gardens of the Imperial Palace to the north, the Shinbashi district to the southeast and the Kasumigaseki government district to the west. The land was occupied by the estates of the Mōri clan and Nabeshima clan during the Edo period, and was used for army maneuvers during the Meiji period. It was converted to a park and opened to the public on June 1, 1903.