- DASMIN
- Deutsche Akkreditierungsstelle Mineralöl GmbH (D)
- DCR
- Declaration of REACH Conformity
- DCT
- Dual-Clutch Transmission
- DEOP
- Diesel Engine Oil Advisory Panel (API/EMA)
- DFI
- Direct Fuel Injection
- DGMK
- Society for Petroleum and Coal Science and Technology (Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e.V.) (D)
- DHyCa
- Direction des Hydrocarbures et des Carburants
- DI
- Detergent Inhibitor
- DIN
- Deutsches Institut für Normung - German Institute for Standardisation
- DLC
- Diamond-Like Carbon
- DME
- Di-Methyl Ether
- DOC
- Diesel Oxidation Catalyst
- DOE
- Department of Energy (USA)
- DOHC
- Double Overhead Cam (twin cam)
- DPD
- Dangerous Preparations Directive
- DPF
- Diesel Particulate Filter
- DRC
- Declaration of REACH Conformity
- DSC
- Differential Scanning Calorimeter
- DSD
- Dangerous Substances Directive
- DYNO
- Dynamometer
