Bayou L'Ourse is a census-designated place (CDP) in Assumption Parish, Louisiana, United States. As of the 2020 census, Bayou L'Ourse had a population of 1,806.
Bayou L'Ourse is located at , located between the Intracoastal Waterway in lower Assumption Parish North along Hwy 662 to Bayou Cheramie on Hwy 398. It is east of Morgan City west of Thibodaux and South of Labadieville.
According to the United States Census Bureau, the CDP has a total area of ,
Bayou L'Ourse was first listed as a census designated place in the 2010 U.S. census.