| Abbreviation | Definition |
|---|---|
| HABS | Haberdashers' Aske's Boys' School |
| HAES | Harding Avenue Elementary School |
| HAHS | Hazleton Area High School |
| HAHS | Hempfield Area High School |
| HAHS | Hinds Agricultural High School |
| HAHS | Huntingdon Area High School |
| HAHS | Hurlstone Agricultural High School |
| HAIS | Hawaii Association of Independent Schools |
| HAIS | Houston Area Independent Schools |
| HAKAS | Have A Kick Ass Summer |
| HALOS | Helping And Leading Our Schools |
| HAMAS | Hiding Among Mosques And Schools |
| HAMS | High Altitude Mountaineering School |
| HAMS | Huntingdon Area Middle School |
| HANDS | Humanitarian Acts in Nepal Developing Schools |
| HAPS | Houston Area Private School |
| HASAP | Heath After school Activities Program |
| HASAWA | Health At School And Work Act |
| HASB | Holy Angels School of Business |
| HASD | Halifax Area School District |