| Acronym | Meaning |
| DMR | Discharge Monitoring Report |
| DMRG | Density Matrix Renormalization Group (quantum Calcn. Method) |
| DMRQA | Discharge Monitoring Report Quality Assurance |
| DMS | Diluted Magnetic Semiconductor |
| DMS | Dimethyl Sulfide |
| DMS | Dynamic Mechanical Spectroscopy |
| DMSP | Defense Meteorological Satellite Program |
| DMTA | Dynamic Mechanical Thermal Analysis |
| DMU | WOCE Data Management Unit (USA) (now Part Of DIU) |
| DMW | Dissimilar-metal Weld |
| DNA | Deoxyribonucleic Acid |
| DNAA | Delayed Neutron Activation Analysis |
| DNAPL | Dense Nonaqueous Phase Liquid |
| DNC | Delayed Neutron Counting |
| DNDI | Drugs For Neglected Diseases Initiative |
| DNMR | Dynamic Nuclear Magnetic Resonance |
| DNO | Delocalized Natural Orbital |
| DNP | Dynamic Nuclear Polarization |
| DNPH | 2,4-Dinitrophenylhydrazine |
| DNR | Department Of Natural Resources |
| DNRC | Department Of Natural Resources And Conservation |
| DNS | Determination Of Nonsignificance |
| DNS | Direct Numerical Simulation |
| DO | Diatomic Orbital |
| DO | Dissolved Oxygen |
| DOA | Dioctyl Adipate |
| DOAS | Differential Optical Absorption Spectroscopy |
| DOBAMBC | P-(n-(decyloxybenzylidene)-p-amino-(2-methylbutyl) Cinnamate |
| DOC | Department Of Conservation |
| DOC | Dissolved Organic Carbon |
| DOCA | Deoxycorticosterone Acetate |
| DOCC | Description Of Current Conditions |
| DOCKET | Enforcement Docket |
| DOD | Department Of Defense |
| DOD | Deutsches Ozeanographisches Datenzentrum |
| DOD | Dissolved Oxygen Deficit |
| DODCI | 3,3'-Diethyloxadicarbocyanine Iodide |
| DODEC | Department Of Defense Environmental Contamination |
| DODISS | Department Of Defense Index Of Specifications And Standards |
| DODS | Different Orbitals For Different Spins |
| DOE | Department Of Energy |
| DOFS | Distributed Optical Fiber Sensing |
| DOI | Department Of The Interior |
| DOI | Digital Object Identifier |
| DOIT | Federal Advisory Committee To Develop On-site Innovative Technologies |
| DOJ | U.S. Department Of Justice |
| DOM | Dissolved Organic Matter |
| DOMES | Deep Ocean Mining Environmental Study |
| DOMO | Doubly Occupied Molecular Orbital |
| DON | Dissolved Organic Nitrogen |