- Ailurin is the language spoken by cats (at least those living in New York) in Diane Duane 's fantasy books.
- Aklo , Tsath-yo , and R'lyehian are ancient and obscure languages in the works of H.P. Lovecraft , Clark Ashton Smith , and others. Aklo is considered by some writers to be the Written Language of the Serpent People
- Amtorian , spoken in some cultures on the planet Venus in Pirates Of Venus by Edgar Rice Burroughs and several sequels. Judged by critic Fredrik Ekman to have "a highly inventive morphology but a far less interesting syntax". (See {Link without Title} .)
- Ancient Language in the Inheritance Trilogy by Christopher Paolini
- Anglic from David Brin 's '' Uplift '' series, along with the numbered languages Galactic One through Galactic Twelve.
- Ata from the novel The Kin Of Ata Are Waiting For You by Dorothy Bryant
- Atreides Battle , in '' Dune '' by Frank Herbert
- Babel-17 , in '' Babel-17 '' by Samuel R. Delany
- Baronh , language of Abh in ''Seikai no Monsho'' ('' Crest Of The Stars '') and others, by Morioka Hiroyuki
- Chakobsa , a language used in the ''Dune'' novels by Frank Herbert
- Chorukor , from Václav Havel 's '' The Memorandum ''
- '' Codex Seraphinianus '' by Luigi Serafini appears to be written in a constructed language which is presumably the language of the alien civilization the book describes
- D'ni
- Drac , language of alien species in Barry B. Longyear 's The Enemy Papers
- Kad'k , the language of the Dwarfs in Terry Pratchett 's Discworld
- Elvish spoken by the Elcyion Lacar, by Katherine Kerr
- Fremen , language of the native people of Arrakis, in '' Dune '' by Frank Herbert
- Galacticspeak from '' The Hitchhiker's Guide To The Galaxy ''
- Gelfling , spoken in Jim Henson 's fantasy epic '' The Dark Crystal ''
- Glide , created by Diana Reed Slattery , used by the Death Dancers of '' The Maze Game ''
- Hardic , Osskilian , and Kargish from Ursula K. LeGuin 's '' Earthsea '' books
- High D'Haran , language used 3000 years ago in D'Hara, in Terry Goodkind 's Sword Of Truth series
- Hressa-Hlab or Old Solar, the original language of the Solar System, in C.S. Lewis ’s Space Trilogy
- Kesh , spoken by the Kesh people in Ursula Le Guin 's '' Always Coming Home ''
- Láadan , in Suzette Haden Elgin 's science fiction novel ''Native Tongue'' and sequels
- Lapine , in '' Watership Down '' by Richard Adams
- Lilliputian from Jonathan Swift 's '' Gulliver's Travels ''. Further samples of the language are provided in T. H. White 's '' Mistress Masham's Repose ''
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- Mangani in the Tarzan novels of Edgar Rice Burroughs
- Marain , in The Culture novels of Iain M. Banks
- the Languages Of Middle-earth (most notably Sindarin , Quenya and Khuzdûl ) by J. R. R. Tolkien , partly published in '' The Lord Of The Rings '', and posthumously discussed in '' The History Of Middle-earth '' and Other Publications .
- Molvanian from '' Molvania , A Land Untouched By Modern Dentistry''
- Nadsat slang, in '' A Clockwork Orange '' by Anthony Burgess
- Newspeak , in '' Nineteen Eighty-Four '' by George Orwell
- The Old Tongue from Robert Jordan 's '' Wheel Of Time '' series
- Parseltongue , the language of Snake s, in the Harry Potter series. The ability of humans to speak it is considered a Magic ability.
- Pennsylvanisch , from Michael Flynn 's ''The Forest of Time''
- Pravic and Iotic , in '' The Dispossessed '' by Ursula K. LeGuin
- Ptydepe from Václav Havel 's '' The Memorandum ''
- Qwghlmian from Neal Stephenson 's '' Cryptonomicon '' and '' The Baroque Cycle ''
- Rihannsu , spoken by the Rihannsu ( Romulan s) in the '' Star Trek '' novels of Diane Duane
- Singlespeech , spoken by the Ler in M. A. Foster 's novels, especially '' The Gameplayers Of Zan ''.
- Stark (short for Star Common), a common interstellar English-based language from Orson Scott Card 's '' Ender '' series
- Starsza Mowa from Andrzej Sapkowski 's Hexer Saga
- Taxilinga - from Neal Stephenson 's '' Snow Crash ''
- Terranglo , Symbospeech , High Thranx , and Low Thranx , and a number of other languages created by Alan Dean Foster for his Humanx Commonwealth milieu
- Troll language from Terry Pratchett 's Discworld
- Utopian Language , appearing in a poem by Petrus Gilles accompanying Thomas More 's '' Utopia ''
- Yilanè from Harry Harrison 's '' West Of Eden '' series
- Zaum , poetic tongue elaborated by Velimir Khlebnikov , Aleksei Kruchonykh , and other Russian Futurists as a "transrational" and "most universal" language "of songs, incantations, and curses".
- Zemblan , created by Vladimir Nabokov in the novel '' Pale Fire ''.
- Several languages spoken by Panurge in François Rabelais ' Pantagruel (1532)
- '' The Time Machine '' featured an unnamed language for the Eloi people.
- Jack Womack 's Dryco novels feature a future form of English with a modified grammar.
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