The Pomoan, or Pomo /ˈpoʊmoʊ/,^[1] languages are a small family of seven languages indigenous to northern California spoken by the Pomo people, whose ancestors lived in the valley of the Russian River and the Clear Lake basin. Four languages are extinct, and all surviving languages except Kashaya have fewer than ten speakers.

John Wesley Powell, who was the first to define the extent of the family, noted that its boundaries were the Pacific Ocean to the west, Wintuan territory in the Sacramento Valley to the east, the head of the Russian River to the north, and Bodega Head and present-day Santa Rosa to the south (Powell 1891:87-88). Only Northeastern Pomo was not contiguous with the other Pomoan languages, being separated by an intervening region of Wintuan speakers.

Pomoan is a family of seven languages. Their relationship to one another was first formally recognized by John Wesley Powell, who proposed that they be called the "Kulanapan Family" (Powell 1891). Like many of Powell's obscure nomenclatural proposals, particularly for California languages, "Kulanapan" was ignored. In its place, Pomo,^[2] the term used by Indians and Whites alike for Northern Pomo, was arbitrarily extended to include the rest of the family.

All seven languages were first systematically identified as Pomo by Samuel Barrett (1908). To avoid complications, Barrett named each of the Pomoan languages according to its geographic position ("Northern Pomo," "Southeastern Pomo," etc.) This naming convention quickly gained wide acceptance and is still in general use, except for the substitution of "Kashaya" for Barrett's "Southwestern Pomo". Barrett's geographical language names often lead those unfamiliar with the Pomoan languages to the misconception that they are dialects of a single "Pomo" language.

Various genetic subgroupings of the family have been proposed, although the general outlines have remained fairly consistent. The current consensus view (cf. Mithun 1999) favors the tree presented in Oswalt (1964), shown below.

Essentially identical versions of this classifications are presented in Oswalt and McLendon's "Introduction" to the Pomo chapters in Heizer, ed. (1978) and in Campbell (1997). The most important dissenter was Abraham M. Halpern, one of the few linguists since Barrett's time to collect comparative data on all of the Pomoan languages.

Halpern's classification differed from Oswalt's mainly in the placement of Northeastern Pomo. Instead of considering it an independent branch of the family, Halpern grouped it with the languages of Oswalt's "Western" branch. He suggested the possibility that Northeastern Pomo represents a recent migration of a Northern Pomo subgroup (Halpern 1964; Golla 2011:106-7).

Proto-Pomo reconstructions by McLendon (1973):^[3]

• Boontling – a constructed dialect of English incorporating Pomo words

• Central, Northern and Southern Pomo Language Apps are available in the App Store. Southern Pomo currently has 2 apps available. One called Learn Southern Pomo - alphabet and one called Southern Pomo Language - Intro.