Diu or DIU may refer to:
Diu is a city which comes in the territory of daman and diu ,India. Even though it comes in the state of Gujarat, Diu is considered separate from it . The language spoken is Gujarati, English, Portuguese and Hindi.
- Diplôme interuniversitaire, a French degree
- Diu, India, a city in Diu district in the union territory of Daman and Diu, India
- Diu district, part of the union territory of Daman and Diu
- Diu Island, an island and part of Diu district
- Diu Head
- Diu Airport's IATA code
- Diu district, part of the union territory of Daman and Diu
- Diu (Cantonese), a Cantonese profanity
- Dansk Interlingua Union or Union Danese pro Interlingua, an organization that promotes Interlingua in Denmark
- Down-With-Imperialism Union, a union formed by Kim Il-sung, president of North Korea
- Dresden International University, part of Dresden University in Germany