Lansdowne House, Ontario redirects here. For the community in Southern Ontario, see Lansdowne, Ontario.

Neskantaga (also known as Lansdowne House, Ontario), is a remote First Nations reserve and community in the northern reaches of the Canadian province of Ontario, situated along the shore of Attawapiskat Lake. The town is linked to the rest of Ontario by the Lansdowne House Airport, and by winter roads and ice roads to points south, via the Northern Ontario Resource Trail. It has a total aboriginal population of 316 people.

Neskantaga is policed by the Nishnawbe-Aski Police Service, an Aboriginal based service.

It is located in the District of Kenora.

Northern Light Mission Trips have been conducted for the children of the community by members of the Tintern Church of Christ in Beamsville, Ontario.