CAAT may stand for:
- Computer Assisted Auditing Techniques Techniques and computer programs that are developed to audit electronic data.
- Computer Assisted Audit Techniques, with respect to the Information technology audit process.
- Center for Alternatives to Animal Testing, a US research center.
- Campaign Against Arms Trade, a British campaigning organisation.
- The CAAT box in molecular genetics.
- The Children's Air Ambulance Trust, a fundraising organisation for the Children's Air Ambulance.
- Cornwall Air Ambulance Trust, a charity that maintains and runs the Cornwall air ambulance.
- Combined Anti-Armor Team - Highly mobile Anti-Armor teams used by the United States Marine Corps.
- Captive Air Amphibious Transporter, a DARPA tracked amphibious vehicle carrying containers from ship to shore.
- A Community Awareness Action Team based in Westminster, Colorado.
- Content Analyst Analytical Technology, an advanced analytics software product developed by Content Analyst Company LLC, based in Reston Virginia.