Lafourche Parish is a parish located in the south of the U.S. state of Louisiana. The parish seat is Thibodaux. The parish was formed in 1807. It was originally the northern part of Lafourche Interior Parish, which consisted of the present parishes of Lafourche and Terrebonne. Lafourche Parish was named after the Bayou Lafourche. City buildings have been featured in television and movies, such as in Fletch Lives, due to its architecture and rich history. At the 2020 census, its population was 97,557.

Thibodaux is a city in, and the parish seat of, Lafourche Parish, Louisiana, United States, along the banks of Bayou Lafourche in the northwestern part of the parish. The population was 15,948 at the 2020 census. Thibodaux is a principal city of the Houma–Bayou Cane–Thibodaux metropolitan statistical area.