Trans-en-Provence (French pronunciation: [tʁɑ̃s ɑ̃ pʁɔvɑ̃s]; Provençal: Tranç) is a commune in the Var department in the Provence-Alpes-Côte d'Azur region in southeastern France.

The village, which was originally located on St Victor's hill, took the name Trans (Latin: "across") on moving across the river Nartuby.

At the end of the twelfth century, the village came under the authority of the Count of Provence who gave it as a fief in 1200 to Giraud de Villeneuve.

In 1931 the Belgian engineer Achille Knapen constructed an experimental air well in Trans-en-Provence.

Its purpose was to collect water from the air by condensation, making use of the temperature difference between night and day.