Mont-de-Marsan
Confluence of the Douze and Midou rivers in Mont-de-Marsan
Administration
Country	France
Region	Aquitaine
Department	Landes
Arrondissement	Mont-de-Marsan
Canton	Chief town of 2 cantons
Intercommunality	Mont-de-Marsan Agglomération
Mayor	Geneviève Darrieussecq (2014–2020)
Statistics
Elevation	23–97 m (75–318 ft) (avg. 60 m/200 ft)
Land area1	36.88 km2 (14.24 sq mi)
Population2	31,009  (2014)
- Density	841/km2 (2,180/sq mi)
INSEE/Postal code	40192/ 40000
Website	www.montdemarsan.fr
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.
2Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once.

Mont-de-Marsan is a commune in southwestern France, in the region of Nouvelle-Aquitaine. It is the prefecture (capital) of the Landes department. and the capital of the arrondissement of Mont-de-Marsan. It is also the capital of 2 cantons in the department: Mont-de-Marsan-1 and Mont-de-Marsan-2.