Louis Frederick Fieser (April 7, 1899 – July 25, 1977) was an American organic chemist, professor, and in 1968, professor emeritus at Harvard University.
He is renowned for inventing military effective napalm whilst he worked at Harvard in 1942.
His award-winning research included work on blood-clotting agents including the first synthesis of vitamin K, synthesis and screening of quinones as antimalarial drugs, work with steroids leading to the synthesis of cortisone, and study of the nature of polycyclic aromatic hydrocarbons.