Antoine Bernard-Jean Marfan (June 23, 1858 – February 11, 1942) was a French pediatrician. He was born in Castelnaudary (département Aude, Languedoc-Roussillon) to Antoine Prosper Marfan and Adélaïde Thuries. He began his medical studies in Toulouse, where he stayed for two years before moving to Paris. He graduated in 1886, his education having been interrupted by a period of military service. In 1903 he became a professor of infantile hygiene in the pediatric clinic of the University of Paris. During the same year, he became a member of the Académie de Médecine.

In 1896, Marfan described a hereditary disorder of connective tissue that was to become known as Marfan syndrome, the term first being used by Henricus Jacobus Marie Weve (1888–1962) of Utrecht in 1931. Today, it is thought that Marfan's patient (a five-year-old girl named Gabrielle) was affected by a condition known as congenital contractural arachnodactyly, and not Marfan's syndrome.

Further eponymous medical conditions named after Antoine Marfan include:

Dennie–Marfan syndrome

Marfan's hypermobility syndrome

Marfan's law

Marfan's sign

Marfan's symptom

Marfan–Madelung syndrome

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