- AARR stands for Anticipated Actuarial Rate of Return (finance)
- AARR stands for Arbitrarily Applicable Relational Responding
- AARR stands for Average Annual Rate of Reduction
- AARR stands for Annual Aggregate Revenue Requirement
- AARR stands for Association of American Railroads
- AARR stands for Argonne Advanced Research Reactor
- AARR