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
hu:Tautológia#Nyelvtudományi és irodalmi tautológia