| Abbreviation | Definition |
|---|---|
| ADIOS | Against Drugs In Ontario Schools |
| ADIS | Abu Dhabi Indian School |
| ADIS | Alcohol and Drug Information School |
| ADIS | Alcohol and Drug Informational School |
| ADIS | Alcohol Drug Information School |
| ADLSOM | Arthur D. Little School Of Management |
| ADSB | Algoma District School Board |
| ADSF | African Day of School Feeding |
| ADSI | African Digital Schools Initiative |
| ADSN | Approved Driving School Network |
| ADSS | Advanced Driving Skills School |
| ADSS | Alberni District Secondary School |
| ADTL | Army-wide Doctrinal and Training Literature |
| ADUSD | Alview Dairyland Union School District |
| ADVP | Adult Developmental Vocational Program |
| AEB | Academic Enrichment Block |
| AED | Automatic External Defibrillator |
| AEFS | American European Flight School |
| AEHS | Ankara Elementary High School |
| AEIS | Amelia Earhart Intermediate School |