BLR may refer to:
- Base Lending Rate
- Bad Lip Reading, a viral video series consisting of improperly lip-synced videos of famous musicians and politicians.
- Belarus
- Bengaluru International Airport; and previously HAL International Airport. BLR is the IATA code of the primary airport in Bangalore, India
- Beta-lactam Ring Records
- Blacklands Railroad
- Blang language, ISO 639:b language designation
- Breech loading rifle
- Browning BLR, a hunting rifle
- Burkitt lymphoma receptor 1 (BLR1), also known as CXCR5
- Blacklight: Retribution, a free first-person shooter game developed by Zombie Studios