Ibaraki 4th district (茨城県第4区 Ibaraki-ken dai-yon-ku or 茨城4区 Ibaraki 4-ku) is a single-member constituency of the House of Representatives in the Diet of Japan. It is located in Northern Ibaraki and consists of the cities of Hitachinaka, Hitachiōta, Hitachiōmiya (without the former village of Gozenyama), Naka and the Naka and Kuji counties. As of 2012, 303,835 eligible voters were registered in the district. Before the electoral reform of 1994, the area was part of the multi-member Ibaraki 2nd district where three Representatives had been elected by single non-transferable vote.