The Tataviam language is an extinct Uto-Aztecan language formerly spoken by the Tataviam people of the upper Santa Clara River basin, Santa Susana Mountains, and Sierra Pelona Mountains in southern California.

Scholars have recognized Tataviam as belonging to the Uto-Aztecan language family, specifically the putative Takic branch.

Based on the most thorough and most recent analysis, it is part of the Serran group along with Kitanemuk and Serrano (Munro and Johnson, 2001).

However, the Beeler and Klar proposal is based on a word-list collected by C. Hart Merriam while the Takic proposals are based on different word lists collected by Alfred Kroeber and John P. Harrington.

The current opinion is that the Merriam word lists represent a dialect of Ventureño (called Alliklik or Castac Chumash) and the Kroeber and Harrington word list represents a divergent Takic language (Tataviam).