Étienne Mathieu (November 21, 1804 – January 16, 1872) was a farmer, land owner and political figure in Quebec.
He represented L'Assomption in the Legislative Assembly of Quebec from 1867 to 1871 as a Conservative.
He was born in Lachenaie, Lower Canada, the son of Jean-Marie Mathieu and Josephte Quenneville.
Mathieu was educated at the Collège Masson à Terrebonne.
In 1830, he married Josephte Duprat.
He was a major in the militia, a justice of the peace and president of the agricultural society at Lachenaie.
He was also a school commissioner and was mayor of Lachenaie from 1867 to 1869.