Klemtu is an unincorporated community on Swindle Island in the coastal fjords of British Columbia, Canada. It is located on Klemtu Indian Reserve No. 1. Klemtu is the home of the Kitasoo tribe of Tsimshians, originally from Kitasu Bay, and the Xai'xais of Kynoch Inlet, a subgroup of the Heiltsuk people. These two tribes live together as, and are jointly governed by, the Kitasoo/Xai'xais Nation. Traditional languages spoken at Klemtu are the southern dialect of the Tsimshian language, called Southern Tsimshian, and Xaixais, a dialect of the Heiltsuk language. In religious affiliation, the community is dominated by the United Church of Canada.