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
- DIA, in functional safety, Development Interface Agreement
- Document Interchange Architecture, an IBM standard for electronic mail, part of IBM Systems Application Architecture
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