Da (play), a Tony-winning play by Hugh Leonard

The D.A. (2004 TV series), an ABC dramatic series

Adi Da, a spiritual leader once known as Da Free John, and Da Love-Ananda

Doomsday argument

Dopamine transmitter

Danish language (ISO 639-1 alpha-2, da)

DeviantArt, an online artistic community

Dark Ages (computer game)

Darmstadt, a town in middle Germany

Dura-Ace, a Shimano racing bicycle groupset

Daniel Amos, the American Rock band

Slang form of the English word "The"

Double action, a type of gun trigger

Democratic Alliance (South Africa), a South African political party.

Dalton (unit), the atomic mass unit

Diploma in Anaesthetics, an obsolete postgraduate qualification in anaesthetic practice

Degtyarev Aviation-mounted, a Soviet machine gun

Delt Ansvarlig Selskap, or DA, a Norwegian company form

Debtors Anonymous

Durham Academy, a private school

Duck's Ass, a 1950's hairstyle

Doctor of Arts degree

District attorney (D.A.), a United States Attorney or County attorney

The D.A. (1971 TV series), an NBC dramatic series

DA postal area

Selskap med delt ansvar, a type of Norwegian company without limited liability

Da (movie), a movie adaptation of the play by Hugh Leonard

DirectAdmin, a graphical web-based management utility

Deerfield Academy, a preparatory boarding school located in Deerfield, Massachusetts.

Department of Agriculture, an executive department in the Philippines.

Deutsche Alternative (German Alternative), a rightist group