Tokyo 1st district is a constituency of the House of Representatives in the Diet of Japan. It is located in eastern mainland Tokyo and covers central parts of the former city of Tokyo. The district consists of the wards of Chiyoda and Shinjuku. As of 2016, 514,974 eligible voters were registered in the district. Before redistricting in 2022, the district included a part of Minato ward which is now in the 7th district.