| Abbreviation | Definition |
|---|---|
| SIPL | Sensor Input Processing Library |
| SIPL | Simple Image Processing Library |
| SIPL | South Independence Public Library |
| SITL | Silence In The Library |
| SJBCL | San Juan Bautista City Library (San Juan Bautista, CA) |
| SJCL | Stanford Javascript Crypto Library |
| SJCPL | St. Joseph County Public Library |
| SJPL | San Jose Public Library |
| SJPLS | San Jose Public Library System |
| SJRL | Screven-Jenkins Regional Library |
| SKOS | Simple Knowledge Organization System |
| SL | Sine Loco (latin, "without a place") |
| SLA | Scottish Library Association |
| SLA | Special Libraries Association |
| SLA | Student Library Assistant |
| SLAC | Student Library Advisory Council |
| SLACAD | School Library Association of Canberra And District |
| SLAIS | School of Library, Archival and Information Studies |
| SLAP | School Library Initiatives for Asia Pacific |
| SLAP | School Library Initiatives for Asia & Pacific |