Dai may refer to:

Names

* Dai (given name), a Welsh or Japanese masculine given name * Dai (surname) (戴), a Chinese surname * Bảo Đại (保大), Emperor of Vietnam from 1926 to 1945

Places and regimes

* Dai Commandery, a commandery of the state of Zhao and in early imperial China * Dai County, in Xinzhou, Shanxi, China * Dai (Eighteen Kingdoms), a short-lived state during the Eighteen Kingdoms period in Chinese history * Dai (Han dynasty), a realm and title during the Han dynasty * Dai (Sixteen Kingdoms), a Xianbei-led dynastic state during the Sixteen Kingdoms era of Chinese history * Dai (Spring and Autumn period), a state during the Spring and Autumn period in Chinese history * Dai (Warring States period), a short-lived state during the Warring States period in Chinese history

People and language

* Da'i al-Mutlaq, or Da'i, a type of religious leader in Islam * Da'i, person engaging in Dawah, the act of inviting people to Islam * Dai language (disambiguation) * Dai people, an ethnic minority of China * Dai (Yindu), or Daai Chin, an ethnic tribe of Chin, Myanmar

Other uses

* Dai (cryptocurrency), a cryptocurrency-backed stablecoin * DAI Personal Computer, an early home computer from Belgium * Mercedes-Benz Group's former Frankfurt Stock Exchange stock symbol * '' De Administrando Imperio'', work written by the 10th-century Byzantine Emperor Constantine VII * '' Deutsches Archäologisches Institut'', or German Archaeological Institute, an archaeological institute operated by the German ministry of foreign affairs * DAI Global, an international development firm * Diamond Aircraft Industries, an aircraft manufacturer * Diffuse axonal injury, a type of traumatic brain injury * Digital Author Identifier, a unique number for an author in the Dutch research system * Direct audio input, a port used in hearing aids and hearing instruments * Distributed artificial intelligence, a subfield of artificial intelligence * Do As Infinity, a Japanese band * '' Dragon Age: Inquisition'', a video game by BioWare * Dynamic ARP Inspection, a security protocol {{Disambiguation, geo