Holland Sackett Duell (January 29, 1881 in Syracuse, Onondaga County, New York – November 25, 1942 in Larchmont, Westchester County, New York) was an American lawyer, US Army officer and politician from New York.
He was the son of Judge Charles Holland Duell (1850–1920) and Harriet M. (Sackett) Duell. He graduated B.A. from Yale College in 1902, and LL.B. from New York Law School in 1904. He was admitted to the bar, and practiced in New York City, specializing in patent law. On September 29, 1904, he married Mabel Halliwell (born 1882), and they had five children; among them Charles Halliwell Duell (born 1905), one of the founders of the Duell, Sloan and Pearce publishing house.
Duell was a member of the New York State Assembly (Westchester Co., 2nd D.) in 1907 and 1909; and was Chairman of the Committee on Federal Relations in 1909.
He fought in World War I as a major with the 306th Field Artillery, 77th Division, American Expeditionary Forces, was afterwards promoted to lieutenant colonel; and was awarded the Distinguished Service Medal, the Croix de guerre, and the Distinguished Service Cross for "extraordinary heroism in combat".