DDO

DDO may refer to:

• David Dunlap Observatory Catalogue, a catalogue of dwarf galaxies that was published in 1959
• DDO (gene), that encodes the D-aspartate oxidase enzyme
• Distant detached objects, class of minor planets in the outer reaches of the Solar System
• Dynamic Drive Overlay, a software technique to extend a system BIOS

• Dungeons & Dragons Online, a massively multiplayer online role-playing game

• Deputy Director for Operations, particularly as the title of a specific CIA official; cf. article
  • The above title is sometimes incorrectly rendered as Deputy Director of Operations; especially this latter term is also in generic use as the title of officials in business or other organizations.
• Director of Operations, particularly in francophone environments, from the French Directeur Des Opérations.
• Diocesan Director of Ordinands, a priest in a Church of England diocese overseeing the ordination process

• DDO Artists Agency, a talent agency
• Dollard-des-Ormeaux, on-island suburb of Montreal in southwestern Quebec, Canada
• Tsez language, by ISO 639-3 code
• Den Danske Ordbog, a dictionary of Danish
• Davao de Oro

• All pages with titles beginning with DDO
• All pages with titles containing DDO

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