Pierre-Eustache Dostaler (May 15, 1809 – January 14, 1884) was a political figure in Quebec.

He represented Berthier in the Legislative Assembly of the Province of Canada from 1854 to 1858 and from 1861 to 1863.

In 1832, he married Geneviève, the daughter of Alexis Mousseau.

In 1867, he was named to the Legislative Council of Quebec for Lanaudière division.

His son Omer served in the Quebec assembly.