Lac-Lapeyrère (French pronunciation: [lak lapeʁɛʁ]) is a municipal unorganized territory, part of Portneuf in Quebec, (Canada).

Territory Lac-Lapeyrère has several major water bodies including lakes Garneau, Travers, Robinson, Casgrain, Tage and Lapeyrère, and is drained to the east by the Batiscan River.

Lac-Lapeyrère unorganized territory was legally constituted on January 1, 1986 and has 411.84 square kilometres (159.01 sq mi).

The designation of these three homonyms refers to a passage in Quebec in 1906 of the warship "Tage" commissioned by Augustin Boué Lapeyrère (1852-1924), who became vice-admiral in 1908 and French Minister of Marine 1909 to 1911.

Mr. Lapeyrère became commander in chief ally in the Mediterranean in 1914 and organized the blockade of the Austro-Hungarian fleet in the Adriatic.