| Acronym | Definition |
|---|
| S4S | Surfaced Four Sides (lumber) |
| S4S | Schools For Schools (humanitarian organization) |
| S4S | Soles4Souls (Nashville, TN) |
| S4S | Subscribe for Subscribe (YouTube) |
| S4S | Skins 4 Skins (Hungary) |
| S4S | Sister for Sister (Charlotte, NC) |
| S4S | SpiCE for Space |
| S4S | Sourcing 4 Success (various locations) |
| S4S | Students 4 Students (National Leadership Conference, University of Wollongong, NSW, Australia) |
| S4S | Strategies for Sustainability (Delta, BC, Canada) |
| S4S | Support 4 Support |
| S4S | Students for Sustainability |
| S4S | Sign for Sign |
| S4S | Soul 4 Sale (band) |
| S4S | Students 4 Sustainability (Delft University of Technology) |
| S4S | Services for Sustainability (website) |
| S4S | Solutions 4 Stone (cleaning products) |
| S4S | Systas 4 Systas, Inc. (New Jersey) |