DDO

DDO stands for:

David Dunlap Observatory Catalogue, a catalog of the David Dunlap Observatory of the dwarf galaxies
Deputy Director for Operations, former name of the head of covert operations within the Central Intelligence Agency (now the National Clandestine Service Director of the )
German disc jockey organization, in 1963 founded company
German Druid Order, 1872, was established club
Dollard -des- Ormeaux, Canadian city in Quebec
Dungeons and Dragons Online, an online computer game
Ddo. , de date, from the date.

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