Boris Vallaud is a French politician who has represented the department of Landes in the French National Assembly since the 2017 elections. A member of the Socialist Party (PS), he became president of the Socialist group in the National Assembly in 2022.

Landes is a department in the Nouvelle-Aquitaine region, Southwestern France, with a long coastline on the Atlantic Ocean to the west. It borders Gers to the east, Pyrénées-Atlantiques, to the south, Lot-et-Garonne to the north-east, and Gironde to the north. It also borders the Atlantic Ocean to the west. Located on the Atlantic coast, it had a population of 413,690 as of 2019. Its prefecture is Mont-de-Marsan.