Martin-Joseph Mengal (27 January 1784 - 4 July 1851) was a Belgian composer and teacher.
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.
In 1825 Mengal returned to Ghent, becoming conductor of the Opera Orchestra in Antwerp in 1830, and shortly afterward took the same position in The Hague.
Mengal was the founding director of the Royal Conservatory of Ghent in 1835 and served as director there until his death.