Montegut is a census-designated place (CDP) in Terrebonne Parish, Louisiana, United States.

Named by Congressman Edward James Gay when the post office was opened in 1885, it honored Gabriel Montegut, a prominent resident of parish seat Houma.

As of the 2020 United States census, there were 1,465 people, 594 households, and 443 families residing in the CDP.

Director Benh Zeitlin and his crew worked out of an abandoned gas station in town.

They built the film's fictional settlement—the "Bathtub"—by hand with found artifacts and rusted-out equipment from the surrounding area.