Xam Neua (, , sometimes transcribed as Sam Nuea or Samneua, literally 'northern swamp'; ), is the capital of Houaphanh Province, Laos.
After fleeing from Phrae, deposed king Phiriya Thepphawong escaped from Northern Thailand to Luang Prabang, residing in Xam Neua from 1903-1909.
It is said that there is a communist re-education camp in Xam Neua and that it was the Pathet Lao capital during the Laotian Civil War Battle of Lima Site 85 (LS-85), 11 March 1968. It is near the Pathet Lao refuges in the Viengxay Caves, which the Lao government hopes to promote as a tourism destination similar to the Củ Chi tunnels near Ho Chi Minh City in Vietnam and the Killing Fields Memorial near Phnom Penh in Cambodia. It is near Nam Et-Phou Louey National Protected Area (pronounced "naam et poo loo-ee").