Marc Émile Pierre Adolphe Tiffeneau (November 5, 1873 – May 20, 1945) was a French chemist who co-discovered the Tiffeneau-Demjanov rearrangement.
In 1899 he graduated from the École de pharmacie de Paris, and afterwards began work as a pharmacy intern in Paris hospitals.
In 1904 he was named chief pharmacist at the Hôpital Boucicaut, and from 1927, worked in a similar capacity at the Hôtel-Dieu de Paris.
From 1926 to 1944 he was a professor of pharmacology to the faculty of medicine at the Sorbonne.Tiffeneau received his Ph.D in sciences in 1907 and his Ph.D in medicine in 1910.