DI
- DIA – (i) U.S. Defense Intelligence Agency
- DIAC – (a) Department of Immigration and Citizenship (Australia)
- DiC – Design Island Centre (computing usually used in a teaching situation)
- DICASS – (p) DIrectional Command Activated Sonobuoy System
- DILLIGAD – (a) Do I Look Like I Give A Damn? (military shorthand, slightly less offensive than the following)
- DILLIGAF – (a) Do I Look Like I Give A Fuck? (military shorthand)
- DIF – (i) Data Interchange Format
- DIFAR – (p) DIrectional Frequency Analysis and Recording
- DIME – (a) Dense Inert Metal Explosive
- DIMM – (a) Dual In-line Memory Module (computing)
- DIN
- (i) Deutsches Institut für Normung (German, "German Institute for Standardization")
- Drug Identification Number (Canadian drug marketing requirement)
- DINA
- (p/a) Diesel Nacional (Spanish, "National Diesel"—Mexican bus and truck manufacturer now known as DINA)
- Dirección de Inteligencia Nacional (Spanish, "National Intelligence Directorate"—former secret police of Chile)
- DINKY – (a) Double Income, No Kids Yet
- DIP – (a) Dual In-line Package (electronics)
- DIPS – (a) Defense independent pitching statistics
- DIR – (i) Defence Industrial Research
- DIS
- (i) Defence Intelligence Staff
- (U.S.) Defense Investigative Service
- Distributed Interactive Simulation
- Draft International Standard (ISO)
- DISA
- (a) U.S. Defense Information Systems Agency
- Distinguished Individual Service Award
- DISCOM – (p) Division Support Command
- DISE – (i) Deployable Intelligence Support Element
- DISSTAF – (a) DIS Search and Target Acquisition Fidelity experiment
- DITY – (i/a) Do-It-Yourself
- div – (s) Dhivehi language (ISO 639-2 code)
- DIVAD – (p) Division Air Defence
- DIY – (i) Do It Yourself
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