Saint-Sever (French pronunciation: [sɛ̃səve], Gascon Sent Sever [sensebe][3]) is a commune in the Landes department in Nouvelle-Aquitaine in southwestern France.

Neighboring communes: Benquet, Bas-Mauco, Audignon, Cauna, Aurice, Montaut, Banos, Coudures, Eyres-Moncube, Montsoué, Montgaillard.

In 1060, after a fire, the abbey was reconstructed on the model of Cluny under the direction of the abbot Gregori de Montaner.

The promenade of Morlanne laid out on the site of a Roman camp called Palestrion commands a fine view of the Adour and the pine forests of the Landes.

The public institutions of the town include the sub-prefecture, a tribunal of first instance, and a practical school of agriculture and viticulture which occupies a former Dominican convent.