Pierre Part is a census-designated place (CDP) in Assumption Parish, Louisiana, United States. The population was 3,169 at the 2010 census, making it the most populous community in Assumption Parish. With 39.3 percent of the population speaking French at home, Pierre Part is the most French town in the United States outside of Maine. Pierre Part is known locally for its prominent French influence and ancestry, which have become significant aspects of its contemporary local culture. Situated near Lake Verret, Pierre Part is a popular local destination for water sports and fishing during the summer.

Assumption Parish is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 21,039. Its parish seat is Napoleonville. Assumption Parish was established in 1807, as one of the original parishes of the Territory of Orleans.