| Acronym | Definition |
|---|
| MYST➣Mystery Science Theater |
| MYST➣Mana Youth Sailing Trust (New Zealand) |
| MYST➣Ministry of Youth, Sport and Tourism (Azerbaijan) |
| MYST➣McGaw YMCA (Young Men's Christian Association) Swim Team (Evanston, IL) |
| MYST➣Meadville YMCA (Young Men's Christian Association) Swim Team (Meadville, PA) |
| MYST➣Missoula YMCA (Young Men's Christian Association) Swim Team (Missoula, MT) |