Mechanism may refer to:

• Mechanism (economics), a set of rules for a game designed to achieve a certain outcome
  • Mechanism design, the study of such mechanisms
• Mechanism (engineering), rigid bodies connected by joints in order to accomplish a desired force and/or motion transmission
• Mechanism (biology), explaining how a feature is created
• Mechanism (philosophy), a theory that all natural phenomena can be explained by physical causes
• Mechanism (sociology), a theory that all social phenomena can be explained by the existence of a deterministic mechanism

• "The Mechanism", song by Disclosure
• "Mechanism", song by Front Line Assembly from WarMech
• The Mechanism (TV series), a Netflix TV series

• Machine
• Machine (mechanical)
• Linkage (mechanical)
• Mechanism of action, the means by which a drug exerts its biological effects
• Defence mechanism, unconscious mechanisms aimed at reducing anxiety
• Reaction mechanism, the sequence of reactions by which overall chemical change occurs
• Antikythera mechanism, an ancient Greek analog computer
• Theory of operation, a description of how a device or system should work
• Machine (disambiguation)
• Mechanical
• Mechanics (disambiguation)