Efficiency (disambiguation)
- Algorithmic efficiency
- Effectiveness
- Efficiency
- Efficiency (aerodynamics)
- Efficiency (apartment)
- Efficiency (basketball)
- Efficiency (economics)
- Efficiency (fair division)
- Efficiency (finance)
- Efficiency (network science)
- Efficiency (statistics)
- Efficient (horse)
- Energy efficiency (disambiguation)
- Energy efficiency (physics)
- Inefficiency (disambiguation)
- Knot
- Mechanical efficiency