Attrition may refer to

• Attrition warfare, the military strategy of wearing down the enemy by continual losses in personnel and material
  • War of Attrition, fought between Egypt and Israel from 1968 to 1970
  • War of attrition (game), a model of aggression in game theory
• Loss of personnel by withdrawal (military)
• Attrition (research), loss of participants during an experiment.
• Attrition (dental), loss of tooth structure by mechanical forces from opposing teeth
• Attrition (erosion), the wearing away of rocks in rivers or the sea
• Attrition (film), also known as Final Mission, 2018 american film
• Imperfect contrition, also known as attrition, in Catholic theology
• Customer attrition, loss of business clients or customers
• Language attrition, loss of first language ability by multilingual speakers
  • Second language attrition, loss of second language ability

• Attrition (band), an electronic music band
• Attrition (website), a security website

• Attrition rate
• Deterioration (disambiguation)
• Retention (disambiguation)