Thomas or Tom Clancy may refer to:
Thomas K. Clancy, professor of law at the University of Mississippi School of Law Thomas Owen Clancy, American academic and historian T. Frank Clancy (1871–1936), American politician and businessman Tom Clancy (Australian footballer) (1887–1957), Australian rules footballer Tom Clancy (1947–2013), American author Tom Clancy (Canadian football) (1872–1938), Canadian football coach and player Tom Clancy (Gaelic footballer) (born 1992), Irish Gaelic footballer Tom Clancy (rugby union) (born 1962), Irish rugby player Tom Clancy (singer) (1924–1990), member of the Irish folk singing group The Clancy Brothers