William Henry Bragg (July 2, 1862 – March 12, 1942) was a British-born physicist and X-ray crystallographer. Born in Westward, England, he made significant contributions to the field of science through his pioneering research on the structure of crystals and the properties of X-rays. Bragg was awarded the Nobel Prize in Physics in 1915, which he shared with his son, William Lawrence Bragg, for their work on X-ray crystallography.