- American Society for Indexing
- Offers a directory of thesauri.
- AOD Thesaurus
- Alcohol and drugs thesaurus. Contains over 130,000 records and covers the period from 1972 to 2003.
- Art and Architecture Thesaurus
- The Getty Museum provides this art and architecture thesaurus.
- Astronomy Thesaurus
- Astronomy thesaurus compiled by Robyn and Robert Shobbrook available in English, French, German, Italian, and Spanish.
- Babynames Thesaurus
- An extensive database of babies names with a full explanation of their meanings.
- Connecting Mathematics
- Math thesaurus with five levels of explanations of mathematical terms and ideas.
- Cook's Thesaurus
- Cooking encyclopedia covering thousands of ingredients and kitchen tools.
- Lexical FreeNet
- Online "connected thesaurus" tool allows users to find related words, words that rhyme, words that contain substrings, and more.
- Merriam-Webster Thesaurus
- Searchable database of synonymous words from one of the world's leading lexical reference companies.
- Phrase Thesaurus
- Online thesaurus allowing users to search for similar phrases.
- Roget's Thesaurus Online
- Yahoo! reference arranged by categories and alphabetically.
- Synonyms.net
- Online thesaurus reference resource that also provides images for search terms.
- Thesaurus of Old English
- Old English phrase searches with a variety of search inputs.
- Thesaurus.com
- Free online Roget's Thesaurus of the English Language.
- UNESCO Thesaurus
- Thesaurus developed and used by United Nations Educational, Scientific and Cultural Organization for vocabulary control.
- Visual Thesaurus
- Thesaurus that displays word relationships visually.
- WordNet
- English lexical database developed by the Princeton University Cognitive Science Laboratory.
- WordSift
- Provides a visual representation of the relationship between words through word clouds and images. Also offers definitions.
- Wordsmyth
- Lexical tool and reference that also features a glossary maker, quiz builder, and a crossword puzzle helper.
- World Bank - Thesaurus
- Terminology used by the World Bank in communications for interest-free or low-interest loans and grants in developing countries.
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