SLF

SLF may refer to:


 * Seattle Liberation Front, anti-Vietnam War organization
 * Shuttle Landing Facility, for the Space Shuttle
 * Social Liberal Forum, UK
 * Spotted lanternfly, an insect native to parts of China, India, and Vietnam, and recently invading parts of the eastern US
 * Stephen Lewis Foundation
 * Stiff Little Fingers, Northern Irish punk band
 * Subscriber Location Function in IP Multimedia Subsystem
 * Sun Life Financial, Canada
 * Super low frequency electromagnetic waves
 * Superior longitudinal fasciculus, an association fiber tract in the brain
 * UD SLF, a bus
 * Self loading freight, passengers