Ignatius Michael "Nate" Duffy (January 27, 1875 – October 6, 1958) was an American college football player and coach. He served as the head football coach at Alma College in 1895 and Hillsdale College in 1897. Duffy played football for one season at the University of Michigan, in 1896, and was an assistant coach there the following year while also coaching at Hillsdale.

Biography A native of Ann Arbor, Michigan, Duffy attended Ann Arbor High School.Catalogue of the Ann Arbor High School for the Academic Year of 1894–1895, p. 33, Published by order of the Board of Education, 1895. He attended college at the University of Michigan. In 1895, while a student at Michigan, Duffy served as the head football coach for Alma College in Alma, Michigan.Within our Bounds: A Centennial History of Alma College, p. 156, The College, 1986. His coaching record at Alma was 3–1. He played on Michigan Wolverines football team as a fullback in 1896.1896 Football Team, Bentley Historical Library, University of Michigan, retrieved November 26, 2010. Duffy was a member of the Alpha Epsilon fraternity.The Purple and Gold, Volume XXI, p. 153, 1904, Alpha Epsilon Fraternity. He spent only "a short time in college". In 1897, he served as an assistant coach for the Michigan football team.1897 Football Team, Bentley Historical Library, University of Michigan, retrieved November 26, 2010. That fall, he also coached football at Hillsdale College in Hillsdale, Michigan.

In 1902, Duffy was working as an electrician.The Sixth Decennial Catalogue of the Chi Psi Fraternity, p. 282, 1902. His brothers James E. Duffy and John Duffy also played football for Michigan. Duffy died on October 6, 1958.

Head coaching record

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