KDA or similar may refer to:
KDA (DJ), an English house DJ
K/DA, a virtual K-pop group
Kampfgruppen der Arbeiterklasse, the German name of the Combat Groups of the Working Class, a paramilitary organization in East Germany
Kachin Defense Army
Karachi Development Authority, a defunct urban development organization in Karachi, Pakistan
Kollam Development Authority, an autonomous statutory body responsible for the development of Kollam city, India
Kentucky Distillers' Association, a trade group of distillers that sponsors the Kentucky Bourbon Trail
Kennedy's Disease Association, an American medical charity
Khulna Development Authority, an autonomous statutory body responsible for the development of Khulna city, Bangladesh
Kilodalton (kDa), 1000 unified atomic mass units
Kongsberg Defence & Aerospace, a Norwegian supplier of defence and space related systems and products
Kotelawala Defence Academy, an alternative form of the name of General Sir John Kotelawala Defence University, a Sri Lankan joint services academy
The ISO 639-3 code for the Worimi language, an Australian Aboriginal language