Harry Thomas Cory (May 27, 1870 – March 22, 1955) was an American engineer and professor.

From 1902 to 1911 he held several positions with railway firms including assistant to the general manager for the Southern Pacific Company from 1904–1905 and assistant to the president of Harriman Lines, Arizona and Mexico from 1905–11.

He was also the general manager and chief engineer, California Development Company and La Sociedad de Riego Terrenos de la Baja California, S.A., where he worked on irrigation systems for the Imperial Valley and was in charge of re-diversion of the Colorado River from the Salton Sea, 1906–07.

Cory was a member of the American Society of Civil Engineers, the American Society of Mechanical Engineers, the Bohemian Club (San Francisco), the Faculty Club (Berkeley, California).

He lived in Los Angeles for the last ten years of his life, dying on March 22, 1955.