Mas de Méjanes, Protected agricultural estate in Les Saintes-Maries-de-la-Mer, France

Mas de Méjanes is an estate on the north-west shore of the Étang de Vaccarès, between Arles and Les Saintes-Maries-de-la-Mer. Its owner's house, oldest part dating to the 13th century, is a low two-storey building with a pale rendered facade, terracotta Roman-tile roof and a small square tower with a pyramidal roof; a second stone-and-stucco building has a narrow tower at its left end. The domain also holds rice fields, bulls and horses, an arena, a small tour train, footpaths, a souvenir kiosk and two restaurants.

Méjanes appears in the Livre Rouge of the Arles archbishopric as early as the 10th century, and its history is documented from 1048 through the Authentique du Chapitre d'Arles. In 1240 Hugues des Beaux sold the domain to the Templars, who became lords of Méjanes; their tower served as a beacon linking Arles and Les Saintes-Maries. Judgements against the Templars followed in the 14th century, and the estate passed to the Hospitallers. In 1720-1721 Guillaume de Piquet was consul of Arles during the plague, and Louis XV raised the land to a marquisate; the domain now belongs to the Ricard family.

The arena hosts Camargue events, notably the Réjon d'Or, where the year's best rejoneadors perform. The estate also keeps the name of Jean-Baptiste Marie de Piquet, second Marquis of Méjanes (1729–1786), a bibliophile whose collections founded the municipal library of Aix-en-Provence, now called Bibliothèque Méjanes.

The estate lies on the north-west shore of the Étang de Vaccarès, halfway between Les Saintes-Maries-de-la-Mer and Arles, near the hamlet of Albaron. Visitors explore it on foot, on horseback or by small tour train, and the grounds include an arena, a souvenir kiosk and two restaurants, Le Méjanes and Le Mazet du Vaccarès.

The second Marquis of Méjanes, Jean-Baptiste Marie de Piquet (1729–1786), formed an agriculture society and a weather-observation service on the estate and encouraged vaccination in hospitals. His book collection later founded the Bibliothèque Méjanes in Aix-en-Provence, which bears his name.