Castelnau-le-Lez Castèlnòu de Les (Occitan)
Commune
Church Saint-Jean-Baptiste
Coat of arms
Location of Castelnau-le-Lez
Castelnau-le-Lez Show map of France Castelnau-le-Lez Show map of Occitanie
Coordinates: 43°38′13″N 3°54′07″E / 43.6369°N 3.9019°E / 43.6369; 3.9019
Country	France
Region	Occitania
Department	Hérault
Arrondissement	Montpellier
Canton	Montpellier - Castelnau-le-Lez
Intercommunality	Montpellier Méditerranée Métropole
Government
• Mayor (2020–2026)	Frédéric Lafforgue[1]
Area 1	11.18 km2 (4.32 sq mi)
Population  (2021)[2]	24,888
• Density	2,200/km2 (5,800/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	34057 /34170
Elevation	19–93 m (62–305 ft) (avg. 60 m or 200 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

Castelnau-le-Lez (French pronunciation: [kastɛlno lə lɛz] ^ⓘ; Occitan: Castèlnòu de Les) is a commune in the Hérault department in the Occitanie region of Southern France. Located on the outskirts of Montpellier, it is situated around 3 km (1.8 mi) north of the city centre.

Castelnau-le-Lez is served by Line 2 of the Montpellier tramway.

Hundreds of Jewish children were hidden in the town of Castelnau-le-Lez during the Holocaust. Almost every home hid children, in some cases from multiple families. After the war, the children whose parents had survived were returned to them. The people of the town and the local priest were well aware of the situation and, at least tacitly, supported it.

Castelnau-le-Lez is twinned with:

• Plankstadt, Germany
• Argenta, Emilia–Romagna, Italy
• San Fernando de Henares, Spain

• Communes of the Hérault department
• Giant of Castelnau