Sui, dynasty of China that ruled from 581 to 618. This short-lived dynasty reunified China in 589 after 400 years of division and laid the foundation for further consolidation under the T'ang dynasty. The Sui emperors, Yang Chien (reigned 581-604) and his son Yang Kuang (reigned 604-618), extended the empire, reorganized and centralized the state bureaucracy, and formulated a legal code. The Grand Canal, built to link the two great rivers of China—the Huang He and the Chang—enabled the central government to draw on the rich resources of the lower Chang valley and greatly facilitated the integration of the nation. The Great Wall was refortified, and Chang'an, Luoyang, and Yangzhou were reconstructed. Faced with internal rebellion, Yang Kuang ended his campaigns to conquer the Korean kingdom of Koguryo (612-14). After his defeat by the Eastern Turks (615), he fled to S China, where he was assassinated (618).

Sui can refer to:

• Sui Dynasty of China
• Sui (surname), a transcription of two Chinese surnames
• Sui (Balochistan), a city in Balochistan, Pakistan
• Sui gas field, near Sui, Balochistan, Pakistan
• Sui or Shui people, one of the Kam-Sui peoples, an ethnic group of China and Vietnam
• Sui language spoken by the Shui
• Sui County, Henan, county in Shangqiu, Henan, China
• Sui, a Latin word meaning "oneself"; part of the word suicide and the Latin phrases sui generis and sui iuris
• Sui (粋), an ideal in Japanese aesthetics similar to iki

SUI is a three letter acronym that can refer to:

• The International Olympic Committee country code or the FIFA country code for
• Sonic user interface or speech user interface, similar to GUI for graphical user interface.
• State Unemployment Insurance as paid in New York, United States
• Societate Ukrainian de Interlingua, Interlingua for the Ukrainian Interlingua Society
• Stress urinary incontinence, a form of urinary incontinence
• Standford University Interim, a type of channel model
• Speleological Union of Ireland, is the all-Ireland representative body for caving