| Acronym | Definition |
|---|
| C4S➣Carrera 4S (Porsche 911 model) |
| C4S➣Centre for Sustainability (Transport Research Laboratory; UK) |
| C4S➣Command, Control, Communications, and Computer Systems (US DoD) |
| C4S➣Chondroitin-4 Sulfate |
| C4S➣Computers 4 Seniors (Georgia) |
| C4S➣Camille Cascode Constant Current Source (current limit circuit) |
| C4S➣Clean for Stripper (band) |
| C4S➣Classified Computer Configuration Control System |
| C4S➣Command, Control, Communications, Computers, and Surveillance |
| C4S➣Craig 4 Spokane (Spokane, WA) |