Look up tautology in Wiktionary, the free dictionary.
Tautology may refer to:
- Tautology (language), a redundant statement in literature and rhetoric
 - Tautology (logic), in formal logic, a statement that is true in every possible interpretation
 - Tautology (rule of inference), a rule of replacement for logical expressions
 
See also
- Pleonasm
 - Redundancy (disambiguation)
 - Tautological (disambiguation)
 - Tautonym, a scientific name of a species in which both parts of the name have the same spelling
 
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