Thomas Cahill (1940–2022) was an American scholar and writer.
Thomas or Tom Cahill may also refer to:
Tom Cahill (American football) (1919–1992), American football coach at Army, 1966–1973 Tom Cahill (politician) (1924–1983), Australian politician, member of New South Wales Legislative Assembly Tom Cahill (baseball) (1868–1894), American Major League Baseball player Tom Cahill (footballer, born 1931) (1931–2003), Scottish footballer Tom Cahill (footballer, born 1986), English footballer Tom Cahill (playwright) (1929–2006), Canadian playwright, songwriter, and television producer Thomas J. Cahill (1910–2002), chief of police in San Francisco, California, 1958–1970 Thomas W. Cahill (1864–1951), American athlete, coach and businessman; a founding father of American soccer Thomas Cahill (bishop) (1913–1978), Australian archbishop of Canberra – Goulburn