| D | Duke |
| d.unm. | died unmarried |
| d | died |
| DA | Dame of St Andrew, Order of Barbados; Diploma in Anaesthesia; Diploma in Art |
| DA&QMG | Deputy Adjutant and Quartermaster-General |
| DAA&QMG | Deputy Assistant Adjutant and Quartermaster-General |
| DAAG | Deputy Assistant Adjutant-General |
| DAC | Development Assistance Committee; Diocesan Advisory Committee |
| DACG | Deputy Assistant Chaplain-General |
| DAG | Deputy Adjutant-General, |
| DAMS | Deputy Assistant Military Secretary |
| Darch | Doctor of Architecture |
| das | died on active service |
| dau | daughter |
| DBA | Doctor of Business Administration |
| DBE | Dame Commander, Order of the British Empire |
| DC | District Commissioner; District Council; District of Columbia |
| DCH | Diploma in Child Health |
| DCL | Doctor of Civil Law |
| DCLI | Duke of Cornwall's Light Infantry |
| DCM | Distinguished Conduct Medal |
| DCO | Duke of Cambridge's Own |
| DCP | Diploma in Clinical Pathology; Diploma in Conservation of Paintings |
| DCS | Deputy Chief of Staff; Doctor of Commercial Sciences |
| DCVO | Dame Commander, Royal Victorian Order |
| DD | Doctor of Divinity |
| DDes | Doctor of Design |
| DDMI | Deputy Director of Military Intelligence |
| DDMS | Deputy Director of Medical Services |
| DDPS | Deputy Director of Personal Services |
| DDS | Doctor of Dental Surgery; Director of Dental Services |
| DE | Doctor of Engineering; Delaware |
| DEA | Department of Economic Affairs |
| decd | deceased |
| DEd | Doctor of Education |
| Def | Defence |
| Delegn | Delegation |
| DEng | Doctor of Engineering |
| DEP | Department of Employment and Productivity; European Progressive Democrats |
| Dept | Department |
| Deptl | Departmental |
| Derbys | Derbyshire |
| DES | Department of Education and Science |
| DesRCA | Designer of the Royal College of Art |
| Devpt | Development |
| DFC | Distinguished Flying Cross |
| DFEE | Department for Education and Employment |
| DFM | Distinguished Flying Medal |
| DG | Director General |
| DGAA | Distressed Gentlefolks Aid Association |
| DGStJ | Dame of Grace, Order of St John of Jerusalem |
| DHA | District Health Authority |
| DHL | Doctor of Humane Letters; Doctor of Hebrew Literature |
| DHSS | Department of Health and Social Security |
| DIC | Diploma of the Imperial College |
| DIG | Deputy Inspector-General |
| DIH | Diploma in Industrial Health |
| Dip | Diploma; Diplomatic |
| DipArch | Diploma in Architecture |
| DipBA | Diploma in Business Administration |
| DipEd | Diploma in Education |
| DipEE | Diploma in Electrical Engineering |
| DipLA | Diploma in Landscape Architecture |
| DipM | Diploma in Marketing |
| DipTh | Diploma in Theology |
| DipTP | Diploma in Town Planning |
| Dir | Director/director |
| diss. | Dissolved |
| Dist | District |
| Div | Division |
| div. | divorce |
| div | divorced |
| Divnl | Division(al) |
| DJAG | Deputy judge Advocate General |
| DJStJ | Dame of Justice, Order of St John of Jerusalem |
| DL | Deputy Lieutenant |
| DLC | Diploma of Loughborough College |
| DLI | Durham Light Infantry |
| DLJ | Dame of Grace, Order of St Lazarus of Jerusalem |
| DLO | Diploma in Laryngology and Otology |
| DM | Doctor of Medicine |
| DMD | Doctor of Medical Dentistry (Australia) |
| DMO | Director of Military Operations |
| DMR | Diploma in Medical Radiology |
| DMRD | Diploma in Medical Radiological Diagnosis |
| DMRE | Diploma in Medical Radiology and Electrology |
| DMus | Doctor of Music |
| DMW | Dame, St Michael of the Wing (Portugal) |
| DO | Diploma in Ophthalmology; Diploma in Osteopathy |
| DObstRCOG | Diploma of Royal College of Obstetricians and Gynaecologists |
| DoE | Department of the Environment |
| DoI | Department of Industry |
| Dom | Dominus (Lord) |
| DOMS | Diploma in Ophthalmic Medicine and Surgery |
| DP | Data Processing |
| DPA | Diploma in Public Administration; Discharged Prisoners' Aid; Doctor of Public Administration |
| DPH | Diploma in Public Health |
| DPM | Diploma in Psychological Medicine |
| DPR | Director of Public Relations |
| DPSA | Diploma in Public and Social Administration |
| DQMG | Deputy Quartermaster-General |
| Dr | Doctor |
| DRCOG | Diploma of Royal College of Obstetricians and Gynaecologists |
| DS | Directing Staff; Doctor of Science |
| DSAC | Defence Scientific Advisory Council |
| DSC | Distinguished Service Cross |
| DSLJ | Dato Seri Laila Jasa (Brunei) |
| DSM | Distinguished Service Medal |
| DSO | Distinguished Service Order |
| DSocSc | Doctor of Social Science |
| dsp | decessit sine prole (died without issue) |
| dspl | decessit sine prole legitima (died without legitimate issue) |
| dspml | decessit sine prole mascuia legitima (died without legitimate male issue) |
| dspms | decessit sine prole mascula superstite (died without surviving male issue) |
| dsps | decessit sine prole superstite (died without surviving issue) |
| DSS | Department of Social Security; Doctor of Sacred Scripture |
| DSSc | Doctor of Social Science |
| DStJ | Dame of Grace, Most Venerable Order of the Hospital of St John of Jerusalem; Dame of Justice, Most Venerable Order of the Hospital of St John of Jerusalem |
| DTech | Doctor of Technology |
| DTI | Department of Trade and Industry |
| Dunelm | Dunelmensis (of Durham) |
| Dve | Drive |
| DVM | Doctor of Veterinary Medicine |
| dvm | decessit vita matris (died in the lifetime of the mother) |
| dvp | decessit vita patris (died in the lifetime of the father) |
| DVSM | Diploma in Veterinary State Medicine |