Sato (Thai: สาโท, pronounced [sǎː.tʰoː], rtgs: satho) is a traditional northeastern Thailand (Isan) beer style that has been made for centuries from starchy glutinous or sticky rice by growers in that region. Just as other regional varieties made not from grapes but cereal are commonly called wine rather than beer, sato is commonly called Thai rice wine. When brewed in little brown jugs called hai (ไห), it is called lao hai (เหล้าไห) or lao u (เหล้าอุ).
Due to internal migration of people from Isan throughout Thailand, sato (like many forms of northeastern Thai cuisine) has become increasingly familiar to the larger Thai population, as well as to the expatriate and tourist communities. The greater awareness and availability of commercially produced sato have increased its popularity. Under the Thai government's One Tambon One Product program (a government sponsored economic development program abbreviated ๑T๑P and pronounced OTOP), several districts chose revenue-stamped sato as their OTOP product. Brewers today produce sato under such names as "Siam Sato", "Ruan Rak", "Gru Pli", among others.