Eugène Louis-Marie Jancourt (15 December 1815 – 29 January 1901) was a French bassoonist, composer, and pedagogue. A virtuoso bassoonist and teacher at the Paris Conservatoire, Jancourt is mostly known for his method books and the system innovations he made to the “Buffet” style bassoon. He, along with his contemporary and fellow bassoonist Julius Weissenborn, is considered by many scholars to be one of the most important bassoonists of the 19th century.