Diu

Diu may refer to:
 * Diu, India, a city in Diu district in the union territory of Dadra and Nagar Haveli and Daman and Diu, India
 * Diu district, part of the union territory of Dadra and Nagar Haveli and Daman and Diu
 * Diu Island, an island and part of Diu district
 * Daman and Diu (Lok Sabha constituency)
 * Daman and Diu, former union territory of India, now part of Dadra and Nagar Haveli and Daman and Diu
 * Goa, Daman and Diu, former union territory of India, divided into Goa and Daman and Diu
 * Diu Head, a headland in the Arabian Sea
 * Diu (Cantonese), a Cantonese profanity
 * Buth Diu (died 1972), Sudanese politician

DIU may refer to:
 * Dansk Interlingua Union, an organization that promotes Interlingua in Denmark
 * Defense Innovation Unit, a US Department of Defense organization
 * Diplôme interuniversitaire, a French degree
 * Diu Airport, in Diu, India, IATA code: DIU
 * Divisional Intelligence Unit, police intelligence at the divisional level
 * Down-with-Imperialism Union, a union formed by Kim Il-sung, president of North Korea
 * Dresden International University, part of Dresden University in Germany
 * Dubrovnik International University in Croatia
 * Diamond Is Unbreakable, the fourth part of manga series JoJo's Bizarre Adventure
 * Daffodil International University in Bangladesh