The Tay are an ethnic group of Vietnam.

The group was formed when three brothers (the Nguyen Hue) from the village of Tay Son overthrew the southern regime in 1777 killing the ruling family. After defeating the Trinh family in 1786 Vietnam was briefly unified, but an ongoing war led to their overthrow by Nguyen Anh. In 1802 a unified state was once again declared under the rule of Nguyen Anh as emperor.