Ōshima, Oshima, Ooshima or Ohshima may refer to:
is an island in the Seto Inland Sea that lies between the larger islands of Honshū and Shikoku in Japan. It is part of Ehime Prefecture and is governed by the city of Imabari.
The island is part of the Shimanami Kaidō, an expressway that runs through a chain of islands between Honshū's Hiroshima Prefecture and Shikoku's Ehime Prefecture. The islands serves as one of the anchor points of two majors bridges along the expressway: The Hakata-Ōshima Bridge and the Kurushima-Kaikyō Bridge.
Category:Islands of Ehime Prefecture Category:Islands of the Seto Inland Sea
is an uninhabited island in the Sea of Japan, to the west from Matsumae town and therefore the westernmost point in Hokkaidō. It is part of the town of Matsumae in Matsumae District, Oshima Subprefecture in Hokkaidō, Japan. To distinguish Ōshima from other islands with the same name, it is sometimes known as or .
At , Ōshima is the largest uninhabited island under Japanese sovereignty. The island is a double caldera with a scoria hill rising in the middle. It is the peak of two overlapping stratovolcanoes and their associated calderas, Mount Higashi and Mount Nishi. The highest peak, at , is part of a triple volcano. The peak rises close to from the sea floor. The island consists of mafic alkali and non-alkali volcanic rock, less than 18,000 years old.
On the south side of the island at , there are a lighthouse and a heliport operated by Japan Coast Guard.
Because of volcanic activity and nature conservation, landing on the island requires the approval of the Agency for Cultural Affairs.
Ōshima, Oshima, Ooshima or Ohshima (written: 大島, 大嶋 lit. "big island") is a Japanese surname. Notable people with the surname include:
- Hiromi Oshima, model and playmate
- Hiroshi Ōshima, Japanese ambassador to Nazi Germany during World War II
- Joun Ōshima, noted Japanese sculptor in the Meiji/Taisho era
- Mai Oshima, AKB48
- Masamitsu Ōshima (1884–1965), Japanese herpetologist and ichthyologist
- Michiru Oshima, Japanese composer
- Nagisa Oshima, Japanese film director
- Naoto Ohshima, original character designer of Sonic the Hedgehog and Dr. Robotnik
- Takatō Ōshima, made the first blast furnace and western-style cannons in Japan
- Towa Oshima, manga artist
- Tsutomu Ohshima, martial artist, head of Shotokan Karate of America.
- Yuko Oshima, AKB48