Jean-Baptiste Marie de Piquet, Marquess of Méjanes (1729-1786) was a French aristocrat, public servant and book collector.

Jean-Baptiste Marie de Piquet was born on 5 August 1729 in Arles, France, during the time of the Great Plague of Marseille.

Piquet was educated at the Collège Louis-le-Grand, where his love of reading and books was noticed early on.

On his deathbed, he regretted this lifestyle and wrote his final words to his wife on 30 September 1786: "[I] ask again forgiveness, if I did not contribute to your happiness, as much as I would have liked during the time that we were united together."

He also added a yearly legacy of 5,000 books in annuities for Provence, to continue increasing the number of the collection.