- ADAI stands for Alcohol and Drug Abuse Institute
- ADAI stands for Alabama Department of Agriculture and Industries
- ADAI stands for Apoyo al Desarrollo de Archivos Iberoamericanos (Spanish: Ibero-American Development Support Archives)
- ADAI stands for Assistance Dogs of America, Inc. (Swanton, OH)
- ADAI stands for Art Directors Association of Iowa
- ADAI stands for Automobile Dealers Association of Indiana (Indianapolis, IN)
ADAI