Deformation can refer to:

• Deformation (engineering), changes in an object's shape or form due to the application of a force or forces.
  • Deformation (physics), such changes considered and analyzed as displacements of continuum bodies.
• Deformation (meteorology), a measure of the rate at which the shapes of clouds and other fluid bodies change.
• Deformation (mathematics), the study of conditions leading to slightly different solutions of mathematical equations, models and problems.
• Deformation (volcanology), a measure of the rate at which the shapes of volcanoes change.
• Deformation (biology), a harmful mutation or other deformation in an organism.

• Deformity (medicine), a major difference in the shape of a body part or organ compared to its common or average shape.
• Plasticity (physics), the study of the non-reversible deformation of materials subjected to forces.
• Super-deformed, or the chibi style of art associated with anime and manga
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