| D&O | Description and Operations 
| Others |
| D&O | Directors & Officers
| Others |
| D&O | Doctrinal and Organizational
| Others |
| D/o | Daughter of
| Others |
| D/O | Delivery Order
| Others |
| D/O | Disorder
| Others |
| DO | a Batch command that precedes the action to be performed in a loop
| Others |
| DO | Daily Orange
| Others |
| DO | Dark Omens
| Others |
| DO | Data Object
| Others |
| DO | Data Only
| Others |
| DO | Data Operation
| Others |
| DO | Data Optimized
| Others |
| DO | Data Out
| Others |
| DO | Dausa Railway Station
| Others |
| DO | David Ogilvy
| Others |
| DO | Day Off
| Others |
| DO | Day Only
| Others |
| DO | Dc Os
| Others |
| DO | Deep Operations
| Others |
| DO | Definition of
| Others |
| DO | Defractive Optics
| Others |
| DO | Delta Offset
| Others |
| DO | Demi Official
| Others |
| DO | Design Originated
| Others |
| DO | Detention Officer
| Others |
| DO | Device Object
| Others |
| DO | Devine Order
| Others |
| DO | Diario Oficial
| Others |
| DO | Diff Obtain
| Others |
| DO | Diffraction Optics
| Others |
| DO | Diffractive Optic
| Others |
| DO | Diffractive Optics
| Others |
| DO | Digital Order
| Others |
| DO | Diploma in Ophthalmology
| Others |
| DO | Diploma in Osteopathy
| Others |
| DO | Direct Object
| Others |
| DO | Direct Observation
| Others |
| DO | Directly Observed
| Others |
| DO | Director of Operations
| Others |
| DO | Directorate of Operations
| Others |
| DO | Disbursing Officer
| Others |
| DO | Discrete Output
| Others |
| DO | Disease Object
| Others |
| DO | Dispatcher's Office
| Others |
| DO | Dissolved Oxygen
| Others |
| DO | Disto-Occlusive
| Others |
| DO | Distraction Osteogenesis
| Others |
| DO | Distributed Object
| Others |
| DO | District Office
| Others |
| DO | District Office (FDA)
| Others |
| DO | Ditto
| Others |
| DO | Divisional Office
| Others |
| DO | DNSSEC Order
| Others |
| DO | Do Over
| Others |
| DO | Doctor of Osteopathic
| Others |
| DO | Doctor of Osteopathic Medicine
| Others |
| DO | Doctor of Osteopathy
| Others |
| DO | Domain Object
| Others |
| DO | Dominican Republic
| Others |
| do | Dominican Republic (TLD)
| Others |
| DO | DOnnerstag
| Others |
| DO | Door Opening
| Others |
| DO | Dopamine Oxidase
| Others |
| Do | Dornier Flugzeugwerke
| Others |
| DO | Drawing Office
| Others |
| DO | Driving Occupations
| Others |
| DO | Drug Officer
| Others |
| DO | Due Out
| Others |
| DO | Dynamic Object
| Others |
| DO | Dynamic Optimization
| Others |
| Do | Path or way (as in karate-do or taekwon-do)
| Others |