Walter Hermann Bucher (March 12, 1888 – February 17, 1965) was a German-American geologist and paleontologist.
His early works were on paleontology, and he performed studies of stromatolettia, oolites, and ripple-shaped markings.
It is thought that at this time he worked as a consultant on the Manhattan Project, hypothesizing how the detonation of the atomic bomb could affect the Earth's crust.
In the same year he joined the National Research Council, as a consultant as chairman of the Division of Geology and Geography.
He was also president of the Geological Society of America (1955) and received their Penrose Medal in 1960.