Energy efficiency may refer to:
- Energy efficiency (physics), the ratio between the useful output and input of an energy conversion process
- Electrical efficiency, useful power output per electrical power consumed
 - Mechanical efficiency, a ratio of the measured performance to the performance of an ideal machine
 - Thermal efficiency, the extent to which the energy added by heat is converted to net work output or vice versa
 - Luminous efficiency, a measure of how well a light source produces visible light
 - Fuel efficiency, the efficiency of converting potential energy in a fuel into kinetic energy
 - Energy efficiency in transportation, the fuel economy of various modes of transportation
 - Energy-efficient landscaping, a type of landscaping designed for the purpose of conserving energy
 
 - Efficient energy use, minimizing the amount of energy used for a given, constant energy service
 - Energy conservation, reducing energy consumption by using less of an energy service
 
See also
- Energy (disambiguation)
 - Efficiency (disambiguation)
 - Energy rating (disambiguation)
 - All pages with titles containing Energy efficiency
 - All pages with titles containing Energy efficient
 
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