Martin-Joseph Mengal (27 January 1784 - 4 July 1851) was a Belgian composer and instructor. Mengal came from a musical family and received horn and violin lessons as a child, and by the age of 13 played first horn at the Ghent opera. From 1804 Mengal moved to Paris to study at the Conservatoire de Paris with Frédéric Duvernoy and Charles Simon Catel, but in December the same year he joined the French military service and marched in the War of the Third Coalition against Italy, Austria and Prussia under Napoleon I.