| Waitaká | |
| Nativename: | Goytacaz |
| States: | Brazil |
| Extinct: | ? |
| Familycolor: | American |
| Family: | Purian ? |
| Iso3: | none |
| Linglist: | 4x0 |
| Glotto: | none |
Waitaká (Guaitacá, Goyatacá, Goytacaz) is an extinct language of Brazil (Campbell 2012),[1] on the São Mateus River and near Cabo de São Tomé in the state of Rio de Janeiro. Dialects, or at least tribal divisions, were Mopi, Yacorito, Wasu, and Miri.[2] Loukotka (1968) suggests it may have been one of the Purian languages,[3] though others consider this classification "circumstantial".
. Lyle Campbell . Grondona . Verónica . Campbell . Lyle . 2012 . The Indigenous Languages of South America . Classification of the indigenous languages of South America . The World of Linguistics . 2 . Berlin . De Gruyter Mouton . 59–166 . 978-3-11-025513-3.
. John Alden Mason . 1950 . The languages of South America . Julian . Steward . Handbook of South American Indians . 6 . 157–317 . Smithsonian Institution, Bureau of American Ethnology Bulletin 143 . Washington, D.C., Government Printing Office.
. Čestmír Loukotka . Classification of South American Indian languages . registration . UCLA Latin American Center . 1968 . Los Angeles.