Joseph Florimond, Duke of Loubat[1] (January 21, 1831 – March 1, 1927) was a French and American bibliophile, antiquarian, sportsman, and philanthropist.

His father was a French inventor and businessman who was engaged in transport infrastructure development in New York City and Paris.

After traveling extensively in Europe, and dividing the time of his life between the Old and New Worlds, he finally settled in Paris where he died in 1927.

Loubat also donated to the American Museum of Natural History a large collection of Mexican archaeological artifacts assembled on his behalf by Edward Seler in the State of Oaxaca, Mexico; a series of casts of the original Cotzumalhuapa sculptures from the ruins of Santa Lucía Cotzumalguapa, Guatemala, kept in the Ethnological Museum of Berlin; a photographic copy of the "Codex Legislatif," an ancient Aztec codex, preserved in the Library of the Chamber of Deputies, Paris; and a facsimile of the "Codex Vaticanus, No.

In 1873, Loubat's racing schooner, Enchantress, unsuccessfully competed against the Dreadnaught in the Cape May Challenge Cup;[10] in 1874, the Enchantress won in a yacht race from Le Havre to Southampton and brought home the Cape May Cup.