SLF may refer to:
Businesses and organisations Seattle Liberation Front, an anti–Vietnam-War organization Senate Leadership Fund, a United States Republican-aligned super PAC Social Liberal Forum, United Kingdom Stephen Lewis Foundation, supports HIV projects in Africa Sun Life Financial, Canada
Places Shuttle Landing Facility, Kennedy Space Centre, Florida, United States Snowshoe Lava Field, a volcanic field in British Columbia, Canada
Science and technology Spotted lanternfly, an insect native to Asia Subscriber Location Function in IP Multimedia Subsystem Super low frequency electromagnetic waves Superior longitudinal fasciculus, an association fiber tract in the brain
Other uses Stiff Little Fingers, a Northern Irish punk band Student loan forgiveness, a policy UD SLF, a bus