Depletion may refer to:
Environment
- Resource depletion, decline of resources
 - Gas depletion, decline of oil supply
 - Nutrient depletion, loss of nutrients in a habitat
 - Oil depletion, decline of oil supply
 - Overdrafting, extracting groundwater beyond the equilibrium yield of an aquifer
 - Ozone depletion, a decline in the total amount of ozone in Earth's atmosphere
 
Physics
- Depletion force, an effective force in molecular and colloidal systems
 - Depletion region, in semiconductor physics
 - Grain boundary depletion, a mechanism of corrosion
 
Other uses
- Depleted uranium
 - Ego depletion, idea that self-control or willpower draws upon a limited pool of mental resources that can be used up
 - Depletion (accounting), an accounting and tax concept used in mining, timber, petroleum, or other similar industries
 - T-cell depletion, process of T cell removal or reduction
 
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