DDA

DDA may refer to:


 * Dda (DNA-dependent ATPase), a DNA helicase
 * Delhi Development Authority, the planning agency for Delhi, India
 * Demand deposit account, a deposit account held at a bank or other financial institution
 * Demand-driven acquisition, a model of library collection development
 * Deputy district attorney, state prosecution in American legal system
 * Digital differential analyzer, a digital implementation of a differential analyzer
 * Digital differential analyzer (graphics algorithm), a method of drawing lines on a computer screen
 * Disability Discrimination Act 1992, Australian legislation
 * Disability Discrimination Act 1995, UK legislation
 * Disability Discrimination Act (Switzerland)
 * Discontinuous Deformation Analysis, an analysis procedure used in physics and engineering
 * Discrete dipole approximation, method for computing scattering of radiation by particles of arbitrary shape
 * Division on Dynamical Astronomy, a branch of the American Astronomical Society
 * Doha Development Agenda of the World Trade Organization
 * Dual Dynamic Acceleration, an Intel technology for increasing single-threaded performance on multi-core processors
 * Dubai Development Authority, a Dubai Government authority that oversees the development, control, municipal, economic and immigration functions across select free zones clusters and other communities by various master developers throughout Dubai
 * Dutch Dakota Association, a Dutch organisation dedicated to preserving and operating classic aircraft
 * Dynamic difficulty adjustment or dynamic game difficulty balancing, a method of automatically adjusting video game difficulty based on player ability