Montegut is a census-designated place (CDP) in Terrebonne Parish, Louisiana, United States. The population was 1,803 at the 2000 census. It is part of the Houma–Bayou Cane–Thibodaux Metropolitan Statistical Area.
Montegut is located at 29°28′25″N 90°33′19″W / 29.47361°N 90.55528°W / 29.47361; -90.55528 (29.473700, -90.555381).
According to the United States Census Bureau, the CDP has a total area of 4.5 square miles (11.8 km²), of which, 4.5 square miles (11.6 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.54%) is water.