Ogasawara Subprefecture is a subprefecture of the Tokyo Metropolitan Government in Japan. The subprefecture covers the Bonin and Volcano Islands and three isolated islets and is coterminous with the village of Ogasawara. The subprefecture covers 104.41 square kilometers (40.31 sq mi) and has a population of 2,930 in 2023. It maintains a main office on Chichijima and a branch office on Hahajima, the two permanent settlements in the islands.

The Bonin Islands, also known as the Ogasawara Islands (小笠原諸島), is a Japanese archipelago of over 30 subtropical and tropical islands located around 1,000 kilometers (620 mi) SSE of Tokyo and 1,600 kilometers (1,000 mi) northwest of Guam. The group as a whole has a total area of 84 square kilometers (32 sq mi) but only two of the islands are permanently inhabited, Chichijima and Hahajima. Together, their population was 2,560 as of 2021. Administratively, Tokyo's Ogasawara Subprefecture also includes the settlements on the Volcano Islands and the Self-Defense Force post on Iwo Jima. The seat of government is Chichijima.