Sir Henry (Harry) Hamilton Johnston, G.C.M.G., K.C.B. (12 June 1858 - 31 August 1927), was a British explorer, botanist and administrator, one of the key players in the "Scramble for Africa" that occurred at the end of the 19th century.

Harry Frederick Johnston (1853–June 1915) was Surveyor-General of Western Australia from 1896 to 1915.

Herbert Arthur "Harry" Johnston (born April 16, 1902) was a British athlete who competed mainly in the 3000 metre team.

Harry A. Johnston II is a former member of the United States House of Representatives from Florida. He is a member of the Democratic Party.

Henry "Harry" Johnston (born September 26 1919 in Manchester; died 1973) was an English footballer. He was the Football Writers' Association Footballer of the Year in 1951. He spent his entire playing career with Blackpool, with whom he appeared in three FA Cup Finals.