Marcel LaFosse (1894–1969) was a French musician and trumpeter with the Boston Symphony Orchestra.
He studied at the Conservatoire de Paris with Alexandre Petit, and was first Accésit in the Conservatory Prix in 1911.
Conductor Sergei Koussevitzky brought LaFosse to the Boston Symphony as second trumpet in 1926.
LaFosse was also teacher to his nephew, André Come who played trumpet with the Boston Symphony from 1957 until 1987.
Marcel LaFosse was the brother of André Lafosse, who was trombone teacher at the Conservatoire de Paris, and the author of many pedagogical works.