Hitachi Kokubun-ji (常陸国分寺) is a Buddhist temple in Fuchū neighborhood of the city of Ishioka, Ibaraki, Japan, belonging to the Shingon-shū Chizan-ha sect, and is the provincial temple ("kokubunji") of former Hitachi Province. The ruins of the Nara period temple and the nearby nunnery have been collectively protected as a National Historic Site since 1922. In 1952, the designation was upgraded to that of a Special National Historic Site.