- aFRR stands for Automatic Frequency Restoration Reserve (energy)
- AFRR stands for Ascorbate Free Radical Reductase (plant physiology)
- AFRR stands for Alpha Frame Rate Reduction
- AFRR stands for Annual Fixed Revenue Requirement (energy regulation)
- AFRR stands for Alabamians for Real Reform (political group)
- AFRR stands for Air Force Recognition Ribbon
- AFRR stands for Associação Fluminense de Radioamadorismo e Rádio do Cidadão (Portugese)
AFRR