- DIRF stands for Declaração do Imposto de Renda Retido na Fonte (Portuguese: Statement of Income Tax Withheld at Source)
- DIRF stands for Digital Information Research Foundation (India)
- DIRF stands for Dansk Investor Relations Forening (Danish organization)
- DIRF stands for Differential Interest Rate Fix (contracts)
- DIRF stands for Délégation Interrégionale au Recrutement et a la Formation (French: Delegation to Inter Recruitment and Training)
- DIRF stands for Declaracao de Imposto Retido na Fonte (Brazil)
- DIRF stands for Double-Coating Indirect Rosette Formation (immunology)
- DIRF stands for Dynamic Incorrect Read Fault
DIRF