| DIAA | Delaware Interscholastic Athletic Association | |
| DIAAH | Dulles International Airport Access Highway | |
| DIAB | Department of Experimental Diabetology | |
| DIAC | Diapulse Corporation of America | |
| DIAC | Defense Intelligence Analysis Center | |
| DIAC | Dubai International Academic City | |
| DIAC | Durham Integrated Arts Camp | |
| DIAC | Design Industry Advisory Committee | |
| DIAC | Disability Information and Advice Centre | |
| DIAC | Dental Industry Association of Canada | |
| DIAC | Dubai International Aquatic Championships | |
| DIAC | Department of Immigration and Citizenship | |
| DIAC | Directions in Authenticated Ciphers | |
| DIAC | Delaware Information and Analysis Center | |
| DIAC | Delft Intelligent Assembly Cell | |
| DIAC | Dubai International Arbitration Centre | |
| DIAC | Diversity and Inclusion Action Coalition | |
| DIAD | Done In A Day | |
| DIAD | Data In A Day | |
| DIAD | Design And Implementation Assessment Device | |
| DIAD | Adiake, Ivory Coast | |
| DIAE | Agboville, Ivory Coast | |
| DIAE | Delaware Institute for the Arts in Education | |
| DIAE | Delaware Institute for the Arts in Education | |
| DIAE | Department of Ichthyology Aquatic Environment |
