Matimekosh (or Matimekush, officially Matimekosh 3) is a First Nations reserve on Lake Pearce in the Côte-Nord region of Quebec, Canada. Together with the Lac-John Reserve, it belongs to the Innu Nation of Matimekush-Lac John. It is an enclave in the centre of the Municipality of Schefferville, and geographically within the Caniapiscau Regional County Municipality but administratively not part of it. Matimekosh means "small trout".