DDD
- 3D (disambiguation)
- 3D Systems
- Artificial cardiac pacemaker
- D3 (disambiguation)
- DDD (EXID song)
- DDD (Koda Kumi song)
- DDD (album)
- DDDD (disambiguation)
- Data Display Debugger
- David Dorfman Dance
- Def Dames Dope
- Defined daily dose
- Degenerative disc disease
- Delta Delta Delta
- Denali Destroyer Dolls
- Depersonalization-derealization disorder
- Developer! Developer! Developer!
- Dhaalu Airport
- Dichlorodiphenyldichloroethane
- Dictionary of Deities and Demons in the Bible
- Die-deterioration doubling
- Digital Divide Data
- Diners, Drive-Ins and Dives
- Direct distance dialing
- Doe Triple-D
- Domain-driven design
- Dongotono language
- Doomsday device
- Human extinction
- King Dedede
- Membranoproliferative glomerulonephritis
- No Nut November
- SPARS code
- The Boyz (South Korean band)