Dayi

Dayi may refer to:
 * Dayi, Daman District, village in Daman District, Kandahar Province, Afghanistan
 * Dayi method, a computer input method
 * South Dayi District, Volta Region, Ghana
 * North Dayi, one of the constituencies represented by the Parliament of Ghana
 * Dayi language, spoken by the Indigenous people of the Arnhem Land, Australia

China

 * Dayi County (大邑县), of Chengdu, Sichuan
 * Dayi, Yizheng (大仪镇), town in Yizheng City, Jiangsu
 * Dayi, Juye County (大义镇), town in Juye County, Shandong
 * Dayi, Leiyang (大义镇), a town of Leiyang City, Hunan