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 John J. Phelan Jr. (1931–2012), American financier, also president, chairman and chief executive of the New York Stock Exchange John Paul Phelan (born 1978), Irish Fine Gael politician John Leddy Phelan (1924–1976), scholar of colonial Spanish America and the Philippines 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 John C. Phelan (born 1964), American businessman and former United States Secretary of the Navy John Henry Phelan (1877–1957), American oil producer and philanthropist