Hokkaidō 1st district (北海道[第]1区, Hokkaidō-[dai-]ikku) is a single-member constituency of the House of Representatives, the lower house of the national Diet of Japan. It is located in Sapporo, the prefectural capital of Hokkaido. In 2015, 493,140 eligible voters were registered in the district, giving it the lowest electoral weight in Hokkaidō. In 2017, its border were redrawn and it now consists of Sapporo's Chūō ("Centre") and Minami ("South") wards, a portion of Nishi ("West") ward as well as a small part of Kita ("North") ward.