Tom, Thomas or Tommy Johnston may refer to:
Politics Thomas D. Johnston (1840–1902), U.S. Representative from North Carolina Thomas Johnston (Canadian politician) (1821–1903), Canadian industrial and political figure Thomas George Johnston (1849–1905), Canadian physician and political figure Tom Johnston (Saskatchewan politician) (1881–1969), British-born Canadian political figure Tom Johnston (British politician) (1881–1965), Scottish political figure Thomas Dalton Johnston, Canadian politician
Sport Tom Johnston (footballer) (1918–1994), Scottish midfielder; playing career 1938–1956; coaching and managerial career 1956–1978 Tom Johnston (greyhound trainer) (1933–2001), British greyhound trainer Tommy Johnston (1927–2008), Scottish footballer
Music Thomas Jack (Tom Jack Johnston, born 1993), Australian DJ and musician; pioneer of the "tropical house" subgenre Tom Johnston (musician) (born 1948), American musician, co-founder of The Doobie Brothers
Other Thomas Johnston (engraver) (1708–1767), American engraver and organ builder Thomas A. Johnston (1848–1934), American educator Thomas Alan Johnston, Scottish engineer Thomas Brumby Johnston (1814–1897), Scottish cartographer Thomas E. Johnston (born 1967), US federal judge Thomas Henry Johnston (1880–?), New Zealand tram conductor, labourer, miner and strike-breaker Thomas L. Johnston (1927–2009), Scottish scientist Thomas Nicol Johnston (1870–1923), Scottish zoologist Thomas Harvey Johnston (1881–1951), Australian biologist and parasitologist Thomas Henry Johnston (British Army officer) (died 1891) T. J. Johnston (Thomas W. Johnston Jr., born 1956), American lawyer and Anglican bishop
See also Thomas Lipton (1848–1931), Scottish merchant and personality; created Lipton tea brand; also known as Sir Thomas Johnstone Lipton Thomas Johnson (disambiguation)