Matsue (Japanese: 松江市, Hepburn: Matsue-shi) is the capital city of Shimane Prefecture, Japan, located in the Chūgoku region of Honshu. As of 31 March 2023^[update], the city had an estimated population of 196,748 in 91287 households and a population density of 340 persons per km². The total area of the city is 572.99 square kilometres (221.23 sq mi). Matsue is home to the Tokugawa-era Matsue Castle, one of the last surviving feudal castles in Japan.

Matsue is located at the northernmost point of Shimane Prefecture, between Lake Shinji and Nakaumi on the banks of the Ohashi River connecting the two lakes, though the city proper reaches the Sea of Japan coast. Matsue is the center of the Lake Shinji-Nakaumi metropolitan area, which has a population of approximately 600,000 in 2020. The Lake Shinji-Nakaumi metropolitan area is the fourth largest on the Sea of Japan coast after Niigata, Greater Kanazawa, and Fukui.

Matsue has a humid subtropical climate (Köppen climate classification Cfa) with very warm summers and cool winters. Precipitation is abundant throughout the year, and is somewhat heavier in June, July and September. The average annual temperature in Matsue is 15.2 °C (59.4 °F). The average annual rainfall is 1,791.9 mm (70.55 in) with July as the wettest month. The temperatures are highest on average in August, at around 27.1 °C (80.8 °F), and lowest in January, at around 4.6 °C (40.3 °F). The highest temperature ever recorded in Matsue was 38.5 °C (101.3 °F) on 1 August 1994; the coldest temperature ever recorded was −8.7 °C (16.3 °F) on 19 February 1977.

Per Japanese census data, the population of Matsue in 2020 is 203,616 people. Matsue has been conducting censuses since 1920.

Matsue is located within ancient Izumo Province and there are many archaeological sites from the Yayoi, Kofuns and Nara periods within the city borders. The area was also the stronghold of the Amago clan during the Sengoku period. The present-day castle town of Matsue was originally established by Horio Yoshiharu, lord of the Matsue clan, when he built Matsue castle and planned the surrounding town over a five-year period from 1607 to 1611. Matsue continued to be the seat of Matsue Domain under the Tokugawa shogunate until the Meiji restoration. Horio Yoshiharu's son Tadauji died before his father, thus the province was inherited by his grandson Tadaharu. However, Tadaharu died childless so the province was passed on to the Kyōgoku. Kyōgoku Takatsugu served Oda Nobunaga and Toyotomi Hideyoshi. Takatsugu's son Tadataka married the 4th daughter of Hidetada, Hatsu. He served in the Battle of Osaka and reportedly took 300 heads. In 1634, he received the province of Izumo, succeeding the childless Horio Tadaharu. During his rule he was instrumental in engineering projects that helped control the flow of the Hiikawa river.

In 1637, Tadataka also died childless and the domain passed to the Matsudaira clan. Naomasa was the third son of Tokugawa Hideyasu. Hideyasu, daimyō of Echizen Province, himself was the second son of Tokugawa Ieyasu, making Naomasa the grandson of the first Tokugawa Shōgun. Naomasa made a name for himself fighting in the Battle of Osaka at the age of 14. He was daimyō of Ono in Echizen and later Matsumoto in Shinano Province before becoming the ruler of Izumo 1638. Unlike the previous rulers Naomasa had children and his heirs managed to keep Izumo for ten generations until the end of the Edo period. Overall, ten Matsudaira daimyō ruled Matsue. The most famous after the first (Matsudaira Naomasa) is the seventh, Matsudaira Harusato, more commonly referred to as Fumai (不昧公). He revolutionized the administrative system of the Matsue clan which was in financial difficulties and put it back on its feet. He invested in mulberry bushes and promoted special foods like shijimi clams that were a delicacy in Matsue. Harusato was a great enthusiast of Japanese tea ceremony. Because his influence on wagashi, Japanese sweets for the tea ceremony from Matsue are famous, especially one called wakakusa.

Matsue has a mayor-council form of government with a directly elected mayor and a unicameral city council of 34 members. Matsue conributes 11 members to the Shimane Prefectural Assembly. In terms of national politics, the city is part of the Shimane 1st district of the lower house of the Diet of Japan.

Matsue is a major regional commercial center and as one of the base cities of the San'in region, and along with Yonago, there are many head offices of companies operating in the San'in region. Agriculture, commercial fishing and tourism play major roles in the local economy; however, the city has only a small industrial base.