Soju is a clear, colorless distilled alcoholic beverage of Korean origin. It is usually consumed neat, and its alcohol content varies from about 10% to 53% alcohol by volume. Most brands of soju are made in South Korea.

The origin of soju dates back to the 13th century Goryeo, when the Levantine distilling technique was introduced to the Korean Peninsula during the Mongol invasion of Korea (1231–1259), by the Yuan Mongols who had acquired the technique of distilling arak from the Persians during their invasions of the Levant, Anatolia, and Persia. The distilleries were set up around the city of Gaegyeong, the then capital (current Kaesong). In the surrounding areas of Kaesong, soju is still called arak-ju (아락주). Andong soju, the direct root of modern South Korean soju varieties, started as the home-brewed liquor developed in the city of Andong, where the Yuan Mongol's logistics base was located during this era.