| Acronym | Definition |
|---|
| ADD | Address |
| ADD | Additional |
| ADD | Attention Deficit Disorder |
| ADD | Addendum |
| ADD | Addition |
| ADD | Advertisement (slang, chiefly Australian) |
| ADD | Area Development District |
| ADD | Ang Dating Daan (Tagalog: The Old Path; Philippines religious TV show) |
| ADD | Advanced Dungeons and Dragons |
| ADD | Administration on Developmental Disabilities |
| ADD | Anti-Dumping Duty (import tax; various nations) |
| ADD | Adapter Device Driver |
| ADD | Architecture Design and Development (University of Nairobi) |
| ADD | Average Daily Dose |
| ADD | At Deaths Door (Everquest Guild) |
| ADD | Ang Dating Daan (Philippine evangelical group) |
| ADD | Advanced Digital Design |
| ADD | Action on Disability and Development |
| ADD | Assistant District Director |
| ADD | Accidental Death or Dismemberment |
| ADD | Attribute Driven Design (software development) |
| ADD | Agricultural Development Division |
| ADD | Accumulated Degree Days (forensics decomposition rates) |
| ADD | Analog/Digital/Digital (audio CD format, recording/mixing/mastering) |
| ADD | Architectural Design Document |
| ADD | American Dream Denial (System Of A Down song) |
| ADD | Agriculture et Développement Durable |
| ADD | Action pour le Développement Durable (French: Action for Sustainable Development; Niger) |
| ADD | Abbott Diagnostic Division |
| ADD | Arithmetic Developed Daily (textbook) |
| ADD | Arctic Environment Data Directory |
| ADD | Architecture Description Document |
| ADD | Addis Ababa, Ethiopia - Bole (Airport Code) |
| ADD | Ageing & Disability Department |
| ADD | Air Defense District |
| ADD | Algebraic Decision Diagram |
| ADD | Another Dating Disaster (Sex & the City TV show) |
| ADD | Ataturkcu Dusunce Dernegi (Turkish) |
| ADD | Association pour le Développement Durable |
| ADD | Automatic Document Distribution |
| ADD | American Dialect Dictionary |
| ADD | Automated Dispensing Device (drug storage/dispensing) |
| ADD | Aerosol Dispensers Directive (EU) |
| ADD | Athlete Development Director |
| ADD | Alphanumeric Display Device |
| ADD | Additional Driver Discovery |
| ADD | Acceptable Deferred Defect (aviation) |
| ADD | Airstream Direction Detector (measures Angle of Attack) |
| ADD | Automated Design and Documentation |
| ADD | Added Power for Near Vision |
| ADD | assign on-line diagnostic (US DoD) |
| ADD | Add/Drop Distributor (NEC) |
| ADD | Actual Delivery Density (fire sprinklers) |
| ADD | Authorized Digital Dealers |
| ADD | Army Data Dictionary |
| ADD | Americans with Disabilities Decisions |
| ADD | Acoustic Drop Detect |
| ADD | Average Drop Distance |
| ADD | Acoustic Deception Device |
| ADD | Architectural Definition Document |
| ADD | Authorized Derivative Declassifier |
| ADD | Architecture Detail Document |
| ADD | Analog Data Decommutator |
| ADD | Autonomous Dynamics Determination |
| ADD | Attitude Determination Device |
| ADD | Army Digital Division |
| ADD | Acquisition Definition Document |
| ADD | Authorized Development Deviation |
| ADD | Acceleration Driven Damping |
| ADD | Advanced Drug Delivery |
| ADD | Associate Deputy Director (various organizations) |
| ADD | Audio Day Dream (album) |