Attrition may refer to:
- Physical wear
- Attrition warfare, the military strategy of wearing down the enemy by continual losses in personnel and material
- Loss of personnel by Withdrawal (military)
- Attrition (medicine, epidemiology), the loss of participants during an experiment
- Attrition (dental), the loss of tooth structure by mechanical forces from opposing teeth
- Attrition (weathering), the wearing away of rocks in the sea
- Imperfect contrition, also known as attrition, in Catholic theology
- Customer attrition, loss of business clients or customers
- Language attrition, the loss of a first or second language or a portion of that language by either a community or an individual
- War of Attrition, a limited war fought between Egypt and Israel from 1968 to 1970
- Employees leaving a company to join somewhere else
proper names:
- War of attrition (game), a model of aggression in game theory, formulated by John Maynard Smith
- Attrition (band), an electronic music band
- Attrition (website), a security website