Lajos Márk, also known as Louis Marc (25 August 1867, Reteag – 18 March 1942, New York City) was a Hungarian painter, illustrator and poster artist.
Rather than become a full-time student there, he went to Paris and entered the Académie Julian, where he studied for an additional two years with Tony Robert-Fleury and William Bouguereau.
By 1910, he was sufficiently well known as a portrait painter to receive an invitation from the National Arts Club of New York to come to the United States.
In 1912, he married Rózsával Molnár, from Győr, who was a student of the acting teacher, Szidi Rákosi.
At the outbreak of World War I, he went to enlist, but the Austro-Hungarian Ambassador, Konstantin Dumba, rejected his offer, due to his age and the nature of his work.