Frank Diehl Fackenthal (February 22, 1883[1] – September 5, 1968[2]) was an American academic administrator best known for his long association with Columbia University.

[3] The son of the general manager of Brooklyn's Peter Cooper Glue Factory, Fackenthal graduated from the borough's Boys High School in 1902 before earning his undergraduate degree (as a self-described "able C man") from Columbia College in 1906.

[4][5] As a student, his prodigious administrative abilities (reflected by his leadership in various campus organizations, including the Varsity Show and the Columbia Daily Spectator) were recognized by president Nicholas Murray Butler, leading to his appointment as chief clerk (1906–1910), secretary (1910–1937), and provost (1937–1948) of the university.

In December 1965, he was critically injured when his car collided with a truck in White Township, New Jersey, 35 miles south of his country home in Buck Hill Falls, Pennsylvania.

As a result of his injuries, Fackenthal (who never married and had no legitimate children) was forced to permanently relocate from Brooklyn to Buck Hill Falls.