DIA or Dia may refer to:
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Organisations and businesses
- Dia Art Foundation, American non-profit arts institution
- Dia (supermarket chain), Spanish multinational supermarket chain
- Sakartvelos Gogona Skautebis Asociacia 'Dia', the Georgian Girl Scout Association
- Defense Intelligence Agency, United States agency
- Department of Internal Affairs (New Zealand)
- Department of Indian Affairs, Canadian federal department
- Design and Industries Association, British charity
- Detroit Institute of Arts, American art collection
- Deutsches Institut für Altersvorsorge, German public institute
- Directorate Internal Audit of the ECB
- Direzione Investigativa Antimafia, Italian anti-mafia investigation service
- Drug Information Association, for pharmaceuticals and medical devices
- Al Día (disambiguation), various newspapers
- El Día (disambiguation), various newspapers
- O Dia, Brazilian newspaper
People
- Abdourahmane Dia (born 1933), Senegalese diplomat
- Ali Dia (born 1965), Senegalese footballer
- Amadou Dia Ba (born 1958), former Senegalese athlete
- Ciré Dia (born 1980), Senegalese footballer
- Fabe Dia (born 1977), French-Italian athlete
- Issiar Dia (born 1987), French footballer
- Mamadou Dia (1910–2009), the first Prime Minister of the newly independent Senegal
- Modou Dia (born 1950), Senegalese politician
- Mohamed Dia (born 1973), fashion creator
- Omar Dia (born 1955), Senegalese basketball player
- Ousmane Dia (born 1971), Senegalese artist
- Samba Dia (born 1984), French basketball player
- Tidiane Dia (born 1985), Senegalese football player
- Yero Dia (born 1982), French football player
- Meg & Dia, American band
Places
- Dia (island), Greek island off the coast of Crete
- Dia, Mali
- Naxos (island), Greek island in the Aegean, named Dia by the ancient Greeks
Airports
- Davao International Airport (DVO)
- Denver International Airport (DEN)
- Dubai International Airport (DXB)
- Doha International Airport (DOH)
- Durban International Airport
Games and fiction
- A spell from the Final Fantasy franchise
- A spell from the Megami Tensei franchise
- Diamond (Shugo Chara!), also known as Dia, a character from the manga series Shugo Chara!
Other
- Dia (mythology), the sister of Callisto in Greek mythology
- Dia (software), a software program for diagram creation
- DIA (South Korea), Korean army defence intelligence agency
- SS Dia, British cargo ship that sank in the Mediterranean in 1964
- DIA, symbol for the SPDR Dow Jones Industrial Average ETF Trust, formerly Diamonds Trust
- DIA, in telecommunications, Dedicated Internet Access