The Online Dictionary of Playground Slang
- An indexed dictionary providing many of the colloquialisms and slang words used, past and present, over the English-speaking world.
- http://www.odps.org/

Larry's Aussie Slang
- Indexed slang and phrase dictionary.
- http://www.angelescity.com/aussie_slang.html

Internet's Recommended Slang Links
- Large collection of links to slang-related dictionary sites for regional varieties of English. There are also links to specialized slang in English and to sites on slang in German and in Scandinavian languages.
- http://www.spraakservice.net/slangportal/

PseudoDictionary
- Covers slang, made up words, "webspeak", colloquialisms.
- http://www.pseudodictionary.com

Roger's Profanisaurus
- Glossary of sexual slang in English, mostly from Britain.
- http://www.ethick.com/other/Profane.html

Twists, Slugs and Roscoes: A Glossary of Hardboiled Slang
- combination of slang spoken by Philip Marlowe, Sam Spade, Mike Hammer and the Continental Op. When Cagney, Bogart, Robinson and Raft got in a turf war, this is how they talked.
- http://www.miskatonic.org/slang.html

Everyday English and Slang in Ireland
- A comprehensive dictionary of Irish Slang with an "optimised for Print" page. Updated frequently.
- http://www.at.artslink.co.za/~gerry/irish.htm

Australian Slang Dictionary
- Collection of Australian slang words.
- http://www.koalanet.com.au/australian-slang.html

The Alternative English Dictionary
- Part of a collection of on-line dictionaries of so-called "bad language".
- http://www.notam02.no/~hcholm/altlang/ht/English.html

'Strine Decoded: Dictionary of Australian English
- Dictionary covers Australian English, including slang, rhyming slang, Aboriginal English, place names, and animals.
- http://www.artistwd.com/joyzine/australia/strine/

Urban Dictionary
- The vocabulary of everyday life.
- http://www.urbandictionary.com/

A Guide to Irish Slang
- From Arse to Maggot here is a full list of common Irish Slang
- http://www.irishabroad.com/Culture/Slang/

BuzzWhack
- Buzzword-compliant dictionary provides definitions for business buzzwords, slang and jargon.
- http://www.buzzwhack.com/

Filters Magazine slang repository
- slangin' up a fresh plate o' new words fo' that ace! Skateboarding and pop culture.
- http://www.filtersmag.com/Slang/

American Slanguages
- Talk like the locals in cities in America and around the world. The hick to hip translation guide.
- http://www.slanguage.com/

American Slang
- Over 280 common American slang expressions sorted alphabetically.
- http://www.aitech.ac.jp/~itesls/slang/