Barley tea is a roasted-grain-based infusion made from barley. It is a staple across many East Asian countries such as China, Japan, and Korea. It has a toasty, bitter flavor.

In Korea, the tea is consumed either hot or cold, often taking the place of drinking water in many homes and restaurants. In Japan, it is usually served cold and is a popular summertime refreshment. The tea is also widely available in tea bags or bottled in Korea and Japan.

In China, barley tea is called dàmài-chá (大麦茶; 大麥茶) or mài-chá (麦茶; 麥茶), in which dàmài (大麦; 大麥) or mài (麦; 麥) means "barley" and chá (茶) means "tea".

In Japan, barley tea is called mugi-cha (麦茶), which shares the same Chinese characters as Chinese mài-chá (麦茶; 麥茶), or mugi-yu (麦湯; むぎゆ), in which yu (湯; ゆ) also means "hot water".

In Korea, barley tea is called bori-cha (보리차), in which the native Korean bori (보리) means "barley" and Sino-Korean cha (Korean: 차; Hanja: 茶) shares the same Chinese character meaning "tea".

In Taiwanese Hokkien, barley tea is called be̍h-á-tê (麥仔茶), in which be̍h-á (麥仔) means "barley" and tê (茶) means "tea".

The Japanese aristocracy has consumed the tea since the Heian Period. Samurai began to consume it in Sengoku period. During the Edo period, street stalls specializing in barley tea became popular among the common people.

The tea can be prepared by boiling roasted unhulled barley kernels in water or brewing roasted and ground barley in hot water. In Japan, tea bags containing ground barley became more popular than the traditional barley kernels during the early 1980s and remain the norm today. The tea is also available prepackaged in PET bottles.