- A Dictionary of Slang - English slang and colloquialisms currently used in the UK.
- Businessballs.com - Cockney Rhyming Slang - Origins, derivations and dictionary translations. Cockney rhyming slang uses substitute words, usually two, as a coded alternative for another word.
- Carleton County Colloquialisms - Dictionary of the colloquial language of Carleton County, New Brunswick, Canada and Aroostook County, Maine, USA. Audio clips accompany each entry.
- Chinese-English Slang Translations - Various expressions, usually colloquialisms or slang, translated for the benefit of native Chinese speakers learning English.
- Double-Tongued Word Wrester - A growing dictionary of words from the fringes of English, including jargon, slang, and loan words.
- Insultmonger.com - An alphabetized compendium of expressions considered offensive, vituperative, and insulting.
- London Slang - Online word and phrase dictionary of Cockney rhyming slang. Also includes examples of film slang.
- PseudoDictionary - Covers slang, made up words, "webspeak", colloquialisms and accepts contributions for new entries.
- Sayings Explained - Searchable database of well-known sayings, phrases, and slang, along with definitions and origins.
- Slang Search - Definitions of common words in English-language slang, organized by subject area.
- SlangSite.com - A dictionary of slang, webspeak, made up words, and colloquialisms. Submissions welcome.
- The New American Sub-Standard Politically Incorrect Dictionary - A glossary of offensive terms or terms with offensive meanings.
- The Online Slang Dictionary - A global dictionary of English slang.
- Urban Dictionary - U.S. slang dictionary whose submissions and various definitions are subject to votes for inclusion.
