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,[1] and from 1927, worked in a similar capacity at the Hôtel-Dieu de Paris.

[2] He also sat as one of the four members of the Drug Supervisory Body (predecessor of the International Narcotics Control Board) from 1933 until his death.

[1] At the time of his death in 1945 he was president of the Société chimique de France.