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.
Individuals who have created languages intended for international communication.
Language creators whose work has been published in books or other media that they created: 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: