Grand Coteau is a town in St. Landry Parish, Louisiana, United States.

Grand Coteau is on Interstate 49 south of Opelousas and is part of the Opelousas–Eunice Micropolitan Statistical Area.

The first known land grant by the colonial Louisiana government was in 1776 in the area referred to as Buzzard Prairie.

The thriving community had two bakeries, a cobbler, a millinery, a blacksmith shop, a post office, six bars, and nine brothels.

The settlement that grew up around the schools was called St. Charles Town before it was changed to Grand Coteau.

[6] Although thousands of Union troops were encamped in the fields surrounding the Academy during the Civil War, the school was not touched.

[3] In the 19th century the population of Grand Coteau grew with African-Americans, free people of color, Acadians, Creoles, French, Irish, and German immigrants.

[8] According to the United States Census Bureau, the town has a total area of 2.4 square miles (6.2 km2), all land.

The climate in this area is characterized by hot, humid summers and generally mild to cool winters.