The initialism SLR can refer to:
- Satellite laser ranging
- Scalable Linear Recording tape drive backup
- Sea-level rise; see Current sea level rise
- Self-loading rifle, see semi-automatic rifle.
- The UK version of the Belgian FN FAL select fire battle rifle, the L1A1 SLR.
- Semi-linear resolution
- Sending loudness rating
- Simple linear regression, an estimator used in statistics
- Simple LR parser (Simple Left-to-right Rightmost-derivation parser)
- Single-lens reflex camera
- See also: Digital single-lens reflex camera (digital SLR or DSLR)
- Sri Lanka Railways
- Sri Lankan Rupee
- Sta. Lucia Realtors, a professional basketball team.
- Stanford Law Review
- Statutory liquidity ratio
- Sydney Light Rail (now Metro Light Rail)
Also
- The Holden Torana SLR5000, a 1974 Australian muscle car.
- Sports Leicht Rennsport (Sports Light Racing), a name originally given to Mercedes-Benz 300 SLR, the 1955 sportcar racer and was recently handed down to Mercedes-Benz SLR McLaren.
- SLR, the St. Lawrence and Atlantic Railroad's reporting mark