The Kitasoo/Xaixais First Nation, also known as the Kitasoo/Xaixais Nation, is the band government of the First Nations people of Klemtu, British Columbia, Canada. The band comprises two ethnic groups who share an ancient alliance, the Kitasoo, a Tsimshian group, and the Xai'xais, a Heiltsuk group. The government is a member of the Oweekeno-Kitasoo-Nuxalk Tribal Council and a member of the Tsimshian First Nations treaty council.