Mornas (French pronunciation: [mɔʁnas]; Occitan: Mornats) is a commune in the Vaucluse department in the Provence-Alpes-Côte d'Azur region in southeastern France.

In 1430, Pellegrin Brunelli, a gentleman of the household of Pope Martin V, had to surrender the castle to the army of Cardinal de Foix.

[4] The French Wars of Religion brought severe troubles to Mornas, notably in the form of two "sauteries", or "pertuisanades".

In 1562, the Calvinists led by the seigneur de Montbrun seized the castle, massacred women and children, and threw the garrison from the top of the ramparts onto halberds below; there was only one survivor.

Before the French Revolution, the king of France allowed the seigneur of Mornas to lease the woodland to a farmer, who cleared it, thus depriving the village of its supply of firewood.