They have traditionally spoken Taa-laa-wa Dee-ni' Wee-ya' (Tolowa Dee-ni' Language), the Tolowa language, one of the Athabaskan languages.
In 2007, in coordination with the Living Tongues Institute for Endangered Languages, the Confederated Tribes of Siletz Indians produced a "talking dictionary" in this language to aid in preservation and teaching [REF].