The Talossan language (El Glheþ Talossan) is a constructed language created by R. Ben Madison in 1980 for the micronation he founded, the Kingdom of Talossa.

The Association of Talossan Language Organisations (ATLO) maintains http://talossan.com, a Website describing the language for new learners, providing language information, research, and online translation to and from English.

Talossan is the best-known example of the micronational language genre of conlang. The language is spoken and used in the Kingdom of Talossa (El Regipäts Talossan), a "constitutional monarchy" with its own parliament and a bicameral legislature, founded by Madison on December 26, 1979, and also in the Talossan Republic (La Repúblicâ Talossán), formed in 2004 by ex-citizens of the Kingdom.

Talossan is one of the best-known artistic languages on the Internet. It garners perennial interest and respect from online conlangers and conlang aficionados. Of particular interest to them is its large vocabulary—with over 28,000 words in its official dictionary, it is one of the most detailed fictional languages ever invented.

The language is overseen by the Comità per l'Útzil del Glheþ (CÚG; the Committee for the Use of the Language), a group formed in the Kingdom of Talossa by Madison in the 1980s. This group periodically issues Arestadas (reformations) which describe and document changes in the usage of the language, and to the vocabulary. The CÚG maintains a multi-lingual Website providing access to the recent recommendations of the Committee.

In the Republic the language is kept alive by the Talossan-Language project, which built an online dictionary English-Glheþ, Glheþ-English; and the formation of l'Icastolâ, the School of Talossan Language in the Talossan Academy of Arts and Sciences that was established 9 August 2005 with the "The Talossan Academy of Arts and Sciences Act" approved by the Parlamînt.

The language, and its corresponding micronation, are mentioned in the book Conquering Consumerspace: Marketing Strategies for a Branded World by Michael R. Solomon, and the language is documented in two published grammars.

The most significant recent development in the language was the issuance of the Arestada of December 12, 2007. This Arestada instituted a rule for stress that allowed many extraneous stressmarks to be omitted, and simplified the vowel set by recognizing certain letters as allophones of other vowels, and respelled a few strange letter combinations. This Arestada is accepted in the Kingdom, but usage of Talossan in the Talossan Republic often retains pre-Arestada conventions.