Marshall Glecker Holloway (November 23, 1912 – June 18, 1991) was an American physicist who worked at the Los Alamos Laboratory during and after World War II.

He was its representative, and the deputy scientific director, at the Operation Crossroads nuclear tests at Bikini Atoll in the Pacific in July 1946.

During a picnic at Taughannock Falls on June 3, 1940, she and a graduate student, Henry S. Birnbaum, drowned while trying to rescue two women in the water.

These calculations were for evaluating the feasibility of Edward Teller's thermonuclear "Super bomb", and the resulting reports would remain classified for many years.

[10] The fusion cross section calculations were finished by September 1943, and the Purdue group moved to the Los Alamos Laboratory, where most of them, including Holloway, worked on the Water Boiler, an aqueous homogeneous reactor that was intended for use as a laboratory instrument to test critical mass calculations and the effect of various tamper materials.

[18] The Los Alamos National Laboratory had continued research into fusion weapons for many years after Holloway's work in 1942 and 1943,[19] and in 1951 the Atomic Energy Commission, which had replaced the Manhattan Project in 1947,[20] ordered the Laboratory to proceed with designing, building and testing a thermonuclear weapon, popularly known as a hydrogen bomb.

Although Holloway had a well-earned reputation for his administrative ability, Bradbury's decision to put him in charge was not popular, especially with Edward Teller.

"[23][25] The Ivy Mike test on November 1, 1952 was a complete success, but it was not a weapon so much as an experiment to verify the Teller and Stanislaw Ulam's design.