ADD (disambiguation)

For the mathematical operation of adding, see Addition. For the Scottish river, see River Add.

• Attention deficit disorder, a condition now known as attention-deficit hyperactivity disorder, or ADHD
• Administration on Developmental Disabilities, of the United States Administration for Children and Families
• Advanced Dungeons & Dragons
• Ang Dating Daan, a radio-television program in the Philippines
• Bole International Airport, Addis Ababa, Ethiopia, from its IATA airport code
• Arab Digital Distribution, a pay television network in the Middle East and North Africa
• A.D.D. (Audio Day Dream), the first studio album by Blake Lewis, the runner-up on the sixth season of American Idol
• ADD model, a hypothesis in physics to explain the weakness of gravity relative to the other forces
• National rail code for Adderley Park railway station, United Kingdom

• A SPARS code appearing on some compact disc recordings, telling the consumer that the recording was made on analog (A) equipment and digital (D) equipment was used to mix/edit and master the recording
• ADD2 (Advanced Digital Display 2), a designation for Intel SDVO adapter cards
• Accumulated degree days, calculated by summing average daily temperatures and used to determine the state of temperature dependent processes, usually biological
• ADD, a slang acronym for Asian Drinking Disorder, referring to the Alcohol flush reaction
• "A.D.D. (American Dream Denial)", a song on System of a Down's album Steal This Album!
• ADD - automatic dropping device, equipment of rail vehicle pantograph preventing further damage to vehicle or infrastructure by automatically lowering the pantograph in case of damage to carbon strip
• Architectural Design Document, describes the architectural design using the software requirements and the logical model (defined in the Software Requirements Document)