John Logan or Johnny Logan may refer to:
- John Logan (minister) (1748-1788), eighteenth century Scottish poet and minister at Leith
- John Alexander Logan (1826-1886), American soldier and politician
- John Alexander Logan, Jr. (1865-1899), American United States Army General; posthumous Medal of Honor award
- Johnny Logan (basketball) (1921-1977), American basketball player and coach
- John Logan (poet) (1923-1987), American poet and educator
- Johnny Logan (baseball player) (b. 1927), former professional American baseball player
- Johnny Logan (singer) (b. 1954), pseudonym for Australian singer and songwriter Seán Patrick Michael Sherrard
- John Alexander Logan (judge) (b. 1956), Australian judge of the Federal Court of Australia
- John Logan (writer) (b. 1961), American screenwriter and playwright
- John Logan (set designer), American Tony Award winning lighting designer
- John Logan (Australian newsreader), an Australian ABC radio newsreader
- John Logan, a fictional character in Ian McEwan's novel Enduring Love and its 2004 film adaptation
- SS John A. Logan, aka USS Alnitah (AK-127), American US Navy ship in service during the Second World War
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