Henry Shaler Williams (6 March 1847 – July 31, 1918) was an American geologist.

He graduated from Yale College and studied with Louis Agassiz at Cornell University.

He was particularly influential in the development of Sigma Xi, serving as a mentor to the founders and as president of the fledgling organization at Cornell University.

[3][4] State Senator Timothy S. Williams (1800–1849) was his uncle; lumber magnate Henry W. Sage (1814–1897) was his first cousin.

Additions to the reference list: BRICE, William R., 2000, Henry Shaler Williams (1847–1918) and the Pennsylvanian Period: Northeastern Geology and Environmental Sciences, v. 22, no.