Maurice Cossmann, full name Alexandre Édouard Maurice Cossmann (1850 – 1924) was a French paleontologist and malacologist.
Maurice Cossmann's father was an artist draughtsman and a talented lithographer. His early education was at Condorcet College in Paris and he later gained the Diploma of the Central School of Arts and Manufacturing in the same city. He was then employed by the Compagnie des chemins de fer du Nord. Cossmann made all his career there, finally as Chief of the Engineering services (Ingénieur Chef des Services Techniques). Married and without a child, he loved to tell how the arrival of a small collection of fossils had led to his future studies of paleontology. Cossman specialised in the fossils of the Tertiary era. Certain works are still a major reference especially
Cossman published, sometimes collaboratively, 186 works (scientific papers and monographs) between 1879 and 1926 and he was the Editor of Revue critique de paléozoologie et de paléophytologie Paris 1897-1919. His work is described in two obituaries written by G.F.Dollfus in 1925 and A.R.Kabat in 1989.