Marcellin is a given name. Notable people with the name include:
Marcellin Berthelot (1827–1907), French chemist and politician
Marcellin Boule (1861–1942), French palaeontologist
Marcellin Desboutin, French painter, printmaker and writer
Marcellin Champagnat (1789–1840), founder of the Marist Brothers, a religious congregation of men in the Roman Catholic Church dedicated to education
Marcellin Gaha Djiadeu (born 1982), professional Cameroonian football player
Marcellin Mve Ebang (born 1959), Gabonese politician
