was a district located in Ehime Prefecture, Japan.

The district had an estimated population of 40,690 and the total area was 248.73&nbsp;km<sup>2</sup> (combined calculations of the former towns of Shigenobu, Kawachi, and Nakajima).

History

This district was located in what is currently the center of Matsuyama. It was once known as the , where yu means "hot water."

The district was named after the Dōgo Onsen.

  • Due to the 1878 Land Reforms, Kasahaya, Wake, and Kume Districts merged with Onsen District.
  • December 15, 1889 — Due to the city status enforcement, The city of Matsuyama was formed.
  • Around 1897 — Several villages from the Kamiukena District were reassigned to the Onsen District: Ukena, Ebara, Sakamoto, Minamiyoshii, Haishi, and Miuchi.
  • During 1897 — The village of Habu (from Iyo District) was reassigned to Onsen District.
  • During 1897 — The village of Yodo (from Iyo District) was reassigned to Onsen District. (2 towns, 40 towns)
  • November 28, 1898 — The village of Hōjō was elevated to town status. (3 towns, 39 villages)
  • October 1, 1914 — Parts of the village of Tateiwa was merged into the village of Asanami.
  • April 1, 1923 — The village of Dōgo split and merged into the city of Matsuyama and the town of Dōgoyuno (respectively). (3 towns, 38 villages)
  • May 10, 1925 — The village of Furumitsu was merged into the town of Mitsuhama. (3 towns, 37 villages)
  • February 11, 1926 — The villages of Soga, Yūgun, Asami and Miyuki were merged into the city of Matsuyama. (3 towns, 33 villages)
  • February 1, 1932, parts of the town of Dōgoyuno (former village of Dōgo areas) was merged into the city of Matsuyama.
  • June 1, 1937 — The village of Shinhama was merged into the town of Mitsuhama. (3 towns, 32 villages)
  • August 1, 1940 — The villages of Mibu, Kuwabara, Wake, Horie, Shiomi and Hisaeda, and the town of Mitsuhama were merged into the city of Matsuyama. (2 towns, 26 villages)
  • April 1, 1944 — The villages of Habu and Shōseki, and the town of Dōgoyuno were merged into the city of Matsuyama. (1 town, 24 villages)
  • April 1, 1951 — The town of Hōjō, and the villages of Nanba and Masaoka were merged to create the town of Hōjō. (1 town, 22 villages)
  • August 1, 1952 — The village of Higashinakajima was elevated to town status. (2 towns, 21 villages)
  • February 1, 1954 — The village of Gogoshima was merged into the city of Matsuyama. (2 towns, 20 villages)
  • October 1, 1954 — The village of Yodo was merged into the city of Matsuyama. (2 towns, 19 villages)
  • March 31, 1955 — The town of Hōjō, and the villages of Asanami, Tateiwa, Kōno and Awai were merged to create the town of Hōjō. (2 towns, 15 villages)
  • April 25, 1955 — The villages of Kawakami and Miuchi were merged to create the village of Kawauchi. (2 towns, 14 villages)
  • May 1, 1955 — The villages of Idai, Kume, Gomyō and Yuyama were merged into the city of Matsuyama. (2 towns, 12 villages)
  • September 1, 1956 — The villages of Kitayoshii, Minamiyoshii and Haishi were merged to create the town of Shigenobu. (3 towns, 9 villages)
  • September 1, 1956 — The village of Kawauchi and parts of the village of Nakagawa (from Shūsō District) were merged to create the town of Kawauchi. (4 towns, 8 villages)
  • September 30, 1956 — The villages of Ebara and Sakamoto were merged to create the village of Kutani. (4 towns, 7 villages)
  • November 1, 1958 — The town of Hōjō was elevated to city status, thus leaving the district. (3 towns, 7 villages)
  • March 31, 1959 — The village of Jinwa, and the town of Nakajima were merged to create the town of Nakajima. (3 towns, 6 villages)
  • April 10, 1959 — The village of Ukena was merged into the city of Matsuyama. (3 towns, 5 villages)
  • March 31, 1960 — The village of Mutsuno was merged into the town of Nakajima. (3 towns, 4 villages)
  • December 15, 1961 — The village of Ono was merged into the city of Matsuyama. (3 towns, 3 villages)
  • April 1, 1962 — The village of Ishii was merged into the city of Matsuyama. (3 towns, 2 villages)
  • March 31, 1963 — The village of Nishinakajima was merged into the town of Nakajima. (3 towns, 1 village)
  • October 25, 1968 — The village of Kutani was merged into the city of Matsuyama. (3 towns)
  • September 21, 2004 — The towns of Kawauchi and Shigenobu were merged to create the city of Tōon. (1 town)
  • January 1, 2005 — The town of Nakajima, along with the city of Hōjō, was merged into the expanded city of Matsuyama.