AMHS
- Academic Magnet High School
- Aeronautical Message Handling System
- Alaska Marine Highway System
- Albertus Magnus High School
- Alexander Mackenzie High School
- Alexandria Monroe High School
- Amityville Memorial High School
- Anatomically modern Homo sapiens
- Arabia Mountain High School
- Archbishop MacDonald High School
- Archbishop McCarthy High School
- Archbishop Mitty High School
- Archbishop Molloy High School
- Archbishop Murphy High School
- Arlington Memorial School
- Auburn Mountainview High School
- August Martin High School
- Automated Message Handling System
- FOUP
- List of high schools in Massachusetts