ACAT
- ACAT1 mRNA
- Acat (deity)
- Acetyl-coenzyme A acetyltransferase
- Alberta Council on Admissions and Transfer
- Asociación Continental Americana de Trabajadores
- Association for Cognitive Analytic Therapy
- Automated Customer Account Transfer Service
- Cognitive Analytic Therapy
- Glossary of military modeling and simulation
- International A-class catamaran
- Risk management
- Stephen Hawking