A thesaurus is a reference work that lists words grouped together according to similarity of meaning.
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Thesaurus may also refer to:
- Thesaurus (information retrieval), a form of controlled vocabulary that seeks to dictate semantic manifestations of metadata in the indexing of content objects
- Thesaurus (radio transcription service), a syndication service that provided transcribed programs for use by radio stations
- Thesaurus (album), a 1969 album by Claire Fischer
- Thesaurus (vault), as mentioned in Plutarch (see Philopoemen), also used as an altar during the Hellenistic period