Alexandre Jean-Baptiste de Boyer, Marquis d’Éguilles (29 March 1709 – 8 October 1783) was a French administrator who served as an unofficial envoy to Charles Edward Stuart during the 1745 Jacobite Rebellion.

This class formed the Second Estate whose rank derived from holding judicial or administrative posts and were often hard-working professionals, unlike the aristocratic Noblesse d'épée or Nobles of the Sword.

Originally formed to provide security against Barbary Coast pirates, by the 18th century its activities included raiding Muslim merchants in the Eastern Mediterranean.

Lacking the legal education required to follow his father, instead he tried a number of unsuccessful business ventures, including trading olive oil with the Americas and opening a theatre.

Their grandfather, Jean-Baptiste de Boyer (1640–1709), owned a famous art collection containing works by Titian, Caravaggio, Michelangelo, Van Dyck, Poussin, Rubens and Corregio.

[6] After his first wife died in childbirth in 1741, D’Éguilles began production of a two volume guide to his grandfathers' art collection, with copies of the paintings done by the French engraver Pierre-Jean Mariette.

When Charles Edward Stuart launched the Jacobite rising of 1745, D'Argenson asked D’Éguilles to go to Scotland as an unofficial envoy; not being a professional diplomat made it easier to disown him if needed, but he was hampered by his inability to speak English.

[12] In June 1747, D’Éguilles wrote a report on the rising to Count Maurepas, the Naval Minister; this was generally critical of the Jacobite leadership, while his opinion of Charles himself was so low, one option he suggested was the establishment of a Scots Republic, rather than a Stuart restoration.

[16] His return from exile was conditional on remaining in Provence; he spent the rest of his life living quietly in retirement at the family chateau in Éguilles, where he died on 8 October 1783.

[17] His son and heir, Pierre-Jean de Boyer, emigrated in 1791 during the French Revolution and his estates were confiscated, divided into 50 lots, then distributed to local farmers.