Southern Tsimshian, Sgüüx̣s^{[note 1]} (pronounced: /skiːxs/^[9]) or Sgüümk,^[7] is the southern dialect of the Tsimshian language, spoken by the Gitga'ata and Kitasoo Tsimshians in Klemtu, B.C. It became extinct with the death of the last remaining speaker, Violet Neasloss.

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Sgüüx̣s is close to Coast Tsimshian and has been described^[10] as a highly conservative dialect, however the two may not have been mutually intelligible with Coast Tsimshian.^[11] The name Sgüüx̣s means "the language beside."

Specialist John Asher Dunn wrote several articles on the language,^[12] from which the term Southern Tsimshian arose.^[13]