Ston - Susp
- Stone guard
- Stop lamp
- Stopping distance
- Stopping time
- Storage battery
- Storeroom (warehouse)
- Straight-eight engine
- Strainer
- Stratified charge
- Streamlined body
- Street cleaner
- Street sprinkler (street flusher)
- Striking fork
- Stroke
- Stroke-bore ratio
- Stromberg carburetter
- Stub axle
- Stud (stud bolt)
- Stuffing box
