Thomas Bailey or Tom Bailey may refer to:
Thomas A. Bailey (1902–1983), historian and textbook author
Thomas Bailey (priest) (died 1657), 17th century religious controversialist
Thomas L. Bailey (1888–1946), American politician, Governor of Mississippi, 1944–1946
Thomas H. Bailey, founder of mutual fund Janus
Thomas P. Bailey (1867–1949), American educator
Thomas Bailey, the father of Will Bailey, a character on U.S. TV series The West Wing
Tom Bailey (musician) (born 1956), English musician
Tom Bailey (U.S. politician), Libertarian Party member from North Carolina
Tom Bailey (author) (born 1961), American author and editor
Tom Bailey (American football) (1949–2005), American football player
Thomas Jennings Bailey (1867–1963), U.S. federal judge
Thomas Bailey (topographer) (1785–1856), topographer and writer
Tom Bailey (cricketer) (born 1991), cricketer
Tom Bailey (footballer) (born 1888), footballer who played for Lincoln City and Stoke