Lax Ksiluux (also spelled Laxksiluux) is a former Nisga'a village in northwestern British Columbia, Canada. It was located on the south side of the Nass River, between the modern Nisga'a villages of Gitwinksihlkw and Gitlaxt'aamiks.
The community existed prior to the eruption of the Tseax Cone volcano, which occurred in the 18th century. The eruption buried Lax Ksiluux under thick lava flows, along with the nearby Nisga'a community of Wii Lax K'abit. The area is now part of the Nisga'a Memorial Lava Bed Provincial Park, which preserves the volcanic landscape and the historical sites of the affected villages.
The name is of Nisga'a origin, and the site remains a significant cultural and historical location for the Nisga'a Nation.
