| D-CELL | Deployment Cell 
| Others |
| D-D | Define-Define
| Others |
| D-Dance | Dragon Dance
| Others |
| D-DAY | Decision Day
| Others |
| D-DAY | Deliverance Day
| Others |
| D-DAY | Doom's Day
| Others |
| D-DAY | Unnamed Day on which Operations are scheduled to Commence
| Others |
| D-F | Dodd-Frank
| Others |
| D-HAM | Detroit-Hamtramck AsseMbly plant
| Others |
| D-MARS | Desert Mars Analog Ramon Station
| Others |
| D-MAX | Maximun Density
| Others |
| D-MIN | Minimum Density
| Others |
| D-NBAP | Dedicated Node B Application Part
| Others |
| D-PTMS | Directorate for Plans, Training, Mobilization, and Security
| Others |
| D-Sub | D-Subminiature
| Others |
| D-SUB | Series D SUBminiature connector
| Others |
| D-SUB | SUB-minature connector, D-shaped metal shield
| Others |
| D-TEAM | Development Team
| Others |
| d-TGA | Dextro-Transposition of the Great Arteries
| Others |
| d-TGA | Differential Thermal Gravimetric Analysis
| Others |
| D-V-D | Digital Video Disk
| Others |
| D-VWI | Digital Vacuum Wax Injector
| Others |
| D-WRED | Distributed WRED
| Others |
| D-ZUG | Direkt-Zug
| Others |
| D-Zug | Durchgangszug
| Others |
| d. | date/place of death
| Others |
| d. | died [date]
| Others |
| d. i. | das ist
| Others |
| D. Sc. N. | Doctor of Science in Nursing
| Others |
| D.A. | Doctor of Arts
| Others |
| D.A. | ducks a.
| Others |
| D.A.S. | Doctor of Applied Science
| Others |
| D.C. | Detective Comics
| Others |
| D.C. | Doctor of Chiropractic
| Others |
| D.C.B. | Dame Commander, Order of the Bath
| Others |
| D.C.M. | Doctor of Chiropractic Medicine
| Others |
| D.COM | Diploma In Commerce
| Others |
| D.D. | Doctor of Dentistry
| Others |
| D.D.S. | Doctor of Dental Science Doctor of Dental Surgery
| Others |
| D.GG | Destiny.gg
| Others |
| D.H.A.N.P | Diplomate of the Homeopathic Academy of Naturopathic Physicians
| Others |
| D.Ht | Diplomate in Homotherapeutics
| Others |
| D.Int.St. | Doctor of Intercultural Studies
| Others |
| D.L.R. | Deutsche Luft-Reederei (in Germany) German air shipping company
| Others |
| D.Litt | Doctor of Letters
| Others |
| D.LITT | Doctor of Letters (Humanities)
| Others |
| D.LITT | Doctor of Literature
| Others |
| D.M.B.B.P. | Diplomate Manipulative & Body-Based Practices
| Others |
| D.Min. | Doctor of Ministry
| Others |
| D.Miss. | Doctor of Missiology
| Others |