Ditidaht [dee-tee-dot] (also Nitinaht, Nitinat, Southern Nootkan) or diitiidʔaaʔtx̣ is a South Wakashan (Nootkan) language spoken on the southern part of Vancouver Island.

Nitinaht is related to the other South Wakashan languages, Makah and the neighboring Nuu-chah-nulth.

[4] In 2003 the Ditidaht council approved construction of a $4.2 million community school to teach students on the Ditidaht (Malachan) reserve their language and culture from kindergarten to Grade 12.

[5] Ditidaht has been the subject of considerable linguistic research including the publication of texts and, in 1981, an introductory university-level textbook.

Soon afterward the consonants shifted to voiced plosives (/b/, /d/) as part of an areal trend, so the people came to call themselves Ditidaht.