The initialism ADA may refer to—

• Adenosine deaminase
• Aeronautical Development Agency of India's Ministry of Defence
• Air Defense Artillery a branch of the United States Army
• American Decency Association
• American Dental Association
• American Diabetes Association (http://www.diabetes.org/)
• American Dietetic Association (http://www.eatright.org/Public/)
• Americans For Democratic Action
• Americans with Disabilities Act
• Aotearoa Digital Arts (http://ada.waikato.ac.nz/)
• Assistant district attorney
• Average Daily Attendance
• the ISO 639 code for the Adangme language

See also

• Ada