with the death of Delphine Ducloux 
Chitimacha ( // CHIT-i-mə-SHAH  or //, chit-i-MAH-shə ) is a language isolate historically spoken by the Chitimacha people of Louisiana, United States. It became extinct in 1940 with the death of the last fluent speaker, Delphine Ducloux.
Although no longer spoken, it is fairly extensively documented in the early 20th-century work (mostly unpublished) of linguists Morris Swadesh   and John R. Swanton. Swadesh in particular wrote a full grammar and dictionary, and collected numerous texts from the last two speakers, although none of this is published.
Language revitalization efforts are underway to teach the language to a new generation of speakers.    Tribal members have received Rosetta Stone software for learning the language. As of 2015, a new Chitimacha dictionary is in preparation, and classes are being taught on the Chitimacha reservation. 
Chitimacha has recently been proposed to be related to, or a member of, the hypothetical Totozoquean language family. An earlier, more speculative, proposal suggested an affinity with the also hypothetical group of Gulf languages. 
|Close||i iː||u uː|
|Mid||e eː||ə||o oː|
Chitimacha has a grammatical structure which is not dissimilar from modern Indo-European languages but it is still quite distinctive. Chitimacha distinguishes several word classes: verbs, nouns, adjectives (verbal and nominal), quantifiers, demonstratives. Swadesh (1946) states that the remaining word classes are hard to distinguish but may be divided into "into proclitics, postclitics, and independent particles". Chitimacha has auxiliaries which are inflected for tense, aspect and mood, such as to be. Polar interrogatives may be marked with a final falling intonation and a clause final post-position.
Chitimacha does not appear to have adopted any grammatical features from their interactions with the French, Spanish or Americans. 
Verbs are inflected for person and number of the subject. Ambiguity may be avoided by the use of the personal pronouns (shown in the table below), but sentences without personal pronouns are common. There is no gender in the personal pronouns and verbal indexes. Subject and object personal pronouns are identical.
|1st person singular||ʔiš||"I" / "me"|
|2nd person singular||himʔ||"thou" (singular)|
|3rd person singular||hus||"he" / "she" / "him" / "her" / "it"|
|1st person plural||ʔuš||"we"|
|2nd person plural||was||"you" (plural)|
|3rd person plural||hunks||"they" / "them"|
Pronouns are more restricted than nouns when appearing in a possessive construction. Pronouns cannot be proceeded by a possessive unlike nouns.
There are definite articles  in Chitmacha. Nouns are mostly uninflected, there are only approximately 30 nouns (mostly kinship or referring to persons) which distinguish a singular or plural form through a plural suffix or other formations.
Nouns are free, or may be possessed by juxtaposing the possessor and the possessed noun.
ʔiš ʔinž̹i = my father ("I father")
was ʔasi ʔinž̹i = that man's father ("that man father")
- Chitimacha at Ethnologue (18th ed., 2015)
- Raymond Fogelson, William C. Sturtevant. Handbook of North American Indians, V. 14, Southeast. Government Printing Office. pp. 80–. ISBN 978-0-16-087616-5.
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Chitimacha". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
- Robert A. Brightman, 2004, "Chitimacha", In: William Sturtevant (ed.), Handbook of North American Indians, Volume 14: Southeast, p. 642
- Carl Waldman, 2009, Encyclopedia of Native American Tribes
- Swadesh, Morris (1948). "Sociologic Notes on Obsolescent Languages". International Journal of American Linguistics. 14 (4): 226–235. doi: 10.1086/464009. JSTOR 1262876.
- Swadesh, M. (1934). "The phonetics of Chitimacha". Language. 10 (4): 345–362. doi: 10.2307/409490.
- "YouTube – Chitimacha Language Episode – Finding Our Talk 3". youtube.com. Retrieved January 26, 2010.
- "Press Release, Media Room, Rosetta Stone". Retrieved 2012-08-26.
- Larry Abramson (Director) (2010-02-02). "Software Company Helps Revive 'Sleeping' Language". All Things Considered - NPR. Retrieved 2012-08-26.
- Heflin, Judy (August 2015). "The Successful Revival of the Chitimacha Language". Language Magazine. Retrieved 2015-10-03.
- Brown, Cecil H.; Wichmann, Søren; Beck, David (2014). "Chitimacha: A Mesoamerican language in the Lower Mississippi valley". International Journal of American Linguistics. 80 (4): 425–474. doi: 10.1086/677911.
- Swadesh, Morris. 1939. Chitimacha grammar, texts and vocabulary. Franz Boas Collection of Materials for American Linguistics, Mss.497.3.B63c G6.5, American Philosophical Society, Philadelphia.
- Morris Swadesh. 1946. Chitimacha. In Hoijer, Harry (ed.), Linguistic structures of native America, 312-336. New York: Viking Fund.
- David V. Kaufman. 2014. The Lower Mississippi Valley as a Language Area. (Doctoral dissertation, University of Kansas; 299pp.)
- "Chitimacha Language and the Chitimacha Indian Tribe (Chitamacha, Chetimacha, Shetimasha)". Retrieved 2012-08-26.
- John Reed Swanton (1919). A structural and lexical comparison of the Tunica, Chitimacha, and Atakapa languages. Govt. Printing Office. Retrieved 25 August 2012.
- Thomas Noxon Toomey (1914). Relationships of the Chitimachan Linguistic Family. Hervas Laboratories. Retrieved 25 August 2012.
- Cecil H. Brown, Søren Wichmann, and David Beck (2014). Chitimacha: a Mesoamerican language in the Lower Mississippi Valley. International Journal of American Linguistics 80.4. pp. 425–474. Retrieved 7 June 2017.