- Scruples (UK, apoth) (Weight)
- Second (Time)
- Second (angle) (Angle)
- Sections (Area)
- Sextant (Angle)
- Shake (Time)
- Sign (angle) (Angle)
- Slug foot/second
^{2}(Force) - Slug force (Force)
- Slug/cubic foot (Density)
- Slug/hour (Mass Flow)
- Slug/minute (Mass Flow)
- Slug/second (Mass Flow)
- Slugs/foot second (Dynamic Viscosity)
- Spans (Length)
- Spans (Volume)
- Spat (Length)
- Speed of light (Linear Velocity)
- Square (Area)
- Square angstrom (Area)
- Square caliber (Area)
- Square centimetre/second� (Kinematic Viscosity)
- Square centimetres (cm
^{2}) (Area) - Square cubit (Area)
- Square digit (Area)
- Square fathom (Area)
- Square feet (Area)
- Square foot inch of mercury (0 °C)� (Force)
- Square foot inch of mercury (15.56 °C) (Force)
- Square foot/hour� (Kinematic Viscosity)
- Square foot/second� (Kinematic Viscosity)
- Square furlong (Area)
- Square inch/hour� (Kinematic Viscosity)
- Square inch/second� (Kinematic Viscosity)
- Square inches (in
^{2}) (Area) - Square kilometres (km
^{2}) (Area) - Square metre/hour� (Kinematic Viscosity)
- Square metres (m
^{2}) (Area) - Square miles (Int. Nautical) (Area)
- Square miles (Int.) (Area)
- Square millimetre/hour� (Kinematic Viscosity)
- Square millimetre/second� (Kinematic Viscosity)
- Square millimetres (mm
^{2}) (Area) - Square rods (Area)
- Square yards (Area)
- Standard atmosphere (Pressure)
- Stigma (Length)
- Stokes� (Kinematic Viscosity)
- Stones (Weight)

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