Storstockholms Lokaltrafik
| SL | |
| Native name | Storstockholms Lokaltrafik | 
| Company type | Aktiebolag | 
| Industry | Transport | 
| Founded | 
 | 
| Headquarters | Stockholm | 
| Area served | 
 | 
| Revenue | 19.269 billion SEK (roughly €1.88 billion) | 
| Owner | Region Stockholm | 
| Website | sl | 
Storstockholms Lokaltrafik known as SL, (lit. 'Greater Stockholm Local Transport') is the public transport organisation responsible for managing land-based public transport in Stockholm County, Sweden. SL oversees a network that includes the Tunnelbana metro, Pendeltåg commuter trains, buses, trams, local rail, and some ferry services.
SL's network serves approximately 700,000 daily passengers and is financed through a combination of regional taxes and fare revenues. The organisation operates under a unified ticketing system, and contracts with several private operators to run its services, including Transdev, SJ, VR Sverige, Keolis, and Stockholms Spårvägar.