NDA

NDA may stand for:

Military

 * National Defence Academy (India), a military academy in India
 * National Defence Act, legislation for organizing and funding Canada's military
 * National Defense Academy of Japan, a military academy in Japan
 * Nigerian Defence Academy, a military academy in Nigeria
 * Niger Delta Avengers, a militant group in Nigeria's Niger Delta

Politics

 * National Democratic Alliance, a coalition of political parties in India

Organizations

 * National Dance Alliance, sister company of the National Cheer Association
 * National Dance Association, defunct association of the American Alliance for Health, Physical Education, Recreation and Dance
 * National Dental Association, an association for African-American dentists
 * Net Daemons Associates, a computer network and systems administration company
 * New Dutch Academy, an orchestra in The Hague, Netherlands
 * National Democratic Assembly, the English name of the Israeli political party Balad
 * National Disability Authority, an agency of the Irish Department of Children, Equality, Disability, Integration and Youth
 * Northern Domestic Airspace, a Canadian aviation organization
 * Nuclear Decommissioning Authority, an entity of the UK government

Music

 * "NDA" (song), a 2021 song by Billie Eilish
 * "NDA", a song by Megan Thee Stallion from the album Traumazine, 2022

Other

 * National Design Awards, awards given by the American National Design Museum
 * New Drug Application, to get a new drug approved in the United States by the Food and Drug Administration
 * Non-destructive analysis, a way to evaluate a material's properties without destroying it
 * Non-disclosure agreement, a legal contract regarding confidentiality
 * Notre Dame Academy, Patna, a girls' Roman Catholic secondary school in Patna, India
 * Najran Domestic Airport, an airport in Najran, Saudi Arabia
 * Nicolas Dupont-Aignan, a French politician