A language creator, sometimes referred to as a conlanger (/ˈkɒnlæŋər/), is a person who invents constructed languages (or "conlangs").

Individuals who have been hired to create languages.

• Victoria Fromkin - Paku (a.k.a. Pakuni)
• Paul Frommer - Na'vi, Barsoomian
• Madhan Karky - Kiliki
• Marc Okrand - Klingon, Vulcan, Atlantean
• Matt Pearson - Thhtmaa
• David J. Peterson - Dothraki, Valyrian, Kastithanu (Castithan), L'Irathi (Irathient), Indojisnen, Sondiv, Shiväisith, Lishepus, Trigedasleng, Noalath, Inha, Munja'kin
• Wolf Wikeley - Tho Fan

Individuals who have created languages intended for international communication.

• Louis de Beaufront
• Léon Bollack
• James Cooke Brown
• Louis Couturat: Ido language
• George Boeree
• Alexander Gode
• Ján Herkeľ
• Lancelot Hogben
• Alex G. Igbineweka
• Otto Jespersen
• Francis Lodwick:^[1] Common Writing
• Juraj Križanić
• Matija Majar
• Vojtěch Merunka
• Jackson Moore
• Charles Kay Ogden
• Giuseppe Peano: Latino sine flexione
• Kenneth L. Pike
• Waldemar Rosenberger
• Johann Martin Schleyer: Volapük
• Kenneth Searight: Sona
• Jan van Steenbergen
• Edgar de Wahl: Interlingue
• John Wilkins:^[1] unnamed universal language
• L. L. Zamenhof: Esperanto
• Aleksandr Ekaterina Ivanov: Ekaterinan^[2]

Language creators whose work has been published in books or other media that they created:

• Richard Adams: Lapine, in Watership Down
• M.A.R. Barker: Tsolyáni for Tékumel
• Hector Berlioz
• Marion Zimmer Bradley
• Anthony Burgess: Nadsat in A Clockwork Orange and a prehistoric language in Quest for Fire.
• Samuel R. Delany
• Suzette Doctolero: Enchanta from the Encantadia Saga.
• Diane Duane
• Suzette Haden Elgin: Láadan, in the Native Tongue series
• Václav Havel
• Frank Herbert
• Hergé
• Robert Jordan: The Old Tongue in The Wheel of Time
• Ursula K. Le Guin
• Barry B. Longyear
• George Orwell: Newspeak, in Nineteen Eighty-Four
• Christopher Paolini: The Ancient Language in the Inheritance Cycle (Eragon and its sequels)
• Lynne Sharon Schwartz: in The Writing on the Wall
• J. R. R. Tolkien: more than twenty languages including Quenya, Sindarin, Khuzdul; see Languages constructed by J. R. R. Tolkien
• Karen Traviss: Mando'a in the Star Wars expanded universe
• Christian Vander
• Tad Williams: Higher Singing in Tailchaser's Song
• Gene Wolfe: Ascian in The Book of the New Sun

Language creators whose languages are neither international auxiliary languages nor part of popular media, but are nonetheless significant among enthusiasts, have amassed a notable amount of speakers, or do not fit in other categories:

• Sonja Lang: Toki Pona, a minimalist language which has gained a large following and several publications over the years since its creation in 2001.