Marcel Florkin (Liège, 15 August 1900 – 3 May 1979) was a Belgian biochemist. Florkin was graduated in 1928 as a Doctor in Medicine and became in 1934 a professor of biochemistry at the University of Liège. He retired as professor emeritus in 1970.^[1]

In 1951, he was the initiator of the Belgian Society of Biochemistry and Molecular Biology. Together with Christian de Duve, and others, he wrote a proposal for the statutes which was adopted in 1952, on the first general meeting. In 1944, he published a book (translated to English in 1949) concerning biochemical evolution, in which he explained the relevance of evolution for understanding differences in metabolism and chemical makeup between different types of organisms.^[2] In later years he applied the principles of biosemiotics (indicator biology) on biochemistry. In 1946, Marcel Florkin was awarded the Francqui Prize on Biological and Medical Sciences. He was a member of the Association for the intellectual and artistic progress of Wallonia.

• Florkin, M, Concepts of molecular biosemiotics and of molecular evolution, In: Comprehensive Biochemistry, 29A: 1–124, 1974.
• Florkin, M, A History of Biochemistry, American Elsevier Publishing Co., 1972, xviii + 343 pp.^[3]