DDX may refer to:

, a common notation for the differential operator with respect to a variable x DD(X), former program name of a class of U.S. Navy destroyers, that became the Zumwalt-class Differential diagnosis (DDx or D/Dx), a systematic method used to identify unknowns Device Dependent X, graphics device drivers supporting 2D acceleration in the X.Org Server DDX (chemistry), a collective name for DDT and its breakdown products DDE and DDD

See also

3DDX, a rhythm video game

DD10 (disambiguation)

D2X (disambiguation) DX (disambiguation) DXX (disambiguation) DXD (disambiguation)