Nemiscau (or Old Nemaska) is a semi-permanent Cree settlement in northern Quebec, Canada, on Lake Nemiscau. There is no road or airplane access.
Nemiscau is the former site of a Hudson's Bay Company post until 1970. The settlement was abandoned in the mid 1970s when Hydro-Québec proposed hydro-electric development on the Rupert River, which would have resulted in the flooding of the area. Its residents were dispersed to Waskaganish and Mistissini until the new community of Nemaska was built. Since the development plans have been canceled, the Cree originally living here have started to return to Nemiscau, using it as a summer encampment. There are only a handful of year-round residents in Nemiscau.