Edward F. "Ed" Hammel was an American chemist.
Hammel had just completed his Ph.D. at Princeton University when he joined a Canadian heavy water project sponsored by the school in 1941. In June of 1944, Hammel relocated to Los Alamos, where he would become one of the site's foremost experts on plutonium.
After the war, Hammel would remain in Los Alamos. There, he was the leader of CMF-9, the Low Temperature Physics and Cryogenics Group, for several years.
He also gained scientific repute after the war for his work as part of the first team to liquefy pure helium.