John Clancy may refer to:
Politicians John Clancy (Labour politician), leader of Birmingham City Council John Michael Clancy (1837–1903), United States Representative from New York John R. Clancy (1859–1932), United States Representative from New York John T. Clancy (1903–1985), U.S. politician from Brooklyn, New York City J. J. Clancy (North Dublin MP) (1847–1928), Irish Member of Parliament North Dublin, 1885–1918 J. J. Clancy (Sinn Féin politician) (1891–1932), Irish Teachta Dála North Sligo, 1918–1921
Sports Jack Clancy (born 1944), American football player Jack Clancy (Australian footballer) (1934–2014), Australian rules footballer
Others
John Clancy (Medal of Honor) (1860s–?), American soldier and Medal of Honor recipient John Clancy (playwright), American playwright and theater director John Joseph Clancy (bishop) (1856–1912), Bishop of Elphin from 1895 to 1912 John S. J. Clancy (1895–1970), Australian judge John William Clancy (1888–1969), U.S. federal judge John Clancy, American theater composer and orchestrator