Antoine Bernard-Jean Marfan (French pronunciation: ​[ɑ̃twan bɛʁnaʁ ʒɑ̃ maʁfɑ̃]; June 23, 1858 – February 11, 1942) was a French paediatrician. 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 paediatric clinic of the University of Paris. During the same year, he became a member of the Académie de Médecine.