Jean-Adrien Mercier (1899–1995) was a French illustrator, poster artist, and advertising designer. Born in Angers, Mercier received his training at the Ecole des Beaux-Arts (School of Fine Arts) in Angers, and then transferred to the Ecole des Arts Décoratifs (National School of Decorative Arts) in Paris in 1921. He began his career in 1924 as a designer of publicity and cinema posters, a field in which he remained active throughout his life. Between 1925 and 1942 Mercier designed more than 120 cinema posters and also produced numerous commercial posters. Notably, he designed for the house of Cointreau because of connections through his mother, the granddaughter of the founder of the company and daughter of the creator of triple sec Cointreau. Mercier worked there for some forty years, eve