John or Jack Phelan may refer to:

• John J. Phelan (1851–1936), Supreme Knight of the Knights of Columbus and Secretary of the State of Connecticut
• John J. Phelan (boxing) (1872–1946), American boxing commissioner and military officer who served as chairman of the New York State Athletic Commission and was a Major General in the New York Army National Guard.
• John J. Phelan Jr. (1931–2012), American financier who served as president and later chairman and chief executive of the New York Stock Exchange
• John Paul Phelan (born 1978), Irish Fine Gael politician
• John Leddy Phelan (1924–1976), Beveridge Award-winning author of The People and the King: The Comunero Revolution in Colombia, 1781
• John Dennis Phelan (1809–1879), jurist and politician in the southern United States
• Jack Phelan (basketball, born 1925) (1925–2021), American professional basketball player for the Waterloo Hawks and Sheboygan Red Skins
• Jack Phelan (basketball, born 1954) (1954–2020), American college basketball coach of the University of Hartford

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