- Abst stands for Abstract
- ABST stands for Abstain
- ABST stands for Armeebriefstelle (German Army postal station)
- ABST stands for Antigua and Barbuda Sales Tax
- ABST stands for Auxiliary Building Sump Tank
- ABST stands for Azino-Bis-Ethylbenzthiazoline-Sulfonic Acid
ABST