John Marsh may refer to:
Politicians John Marsh (14th-century MP) (fl. 1394–1397), MP for Bath John Marsh (15th-century MP) (fl. 1414–1421), MP for Bath John Allmond Marsh (1894–1952), Canadian member of parliament John O. Marsh Jr. (1926–2019), American congressman and Secretary of the Army
Association football John Marsh (footballer, born 1842) (1842–1880), English cricket player and footballer Jack Marsh (footballer, born 1922) (John Kirk Marsh, 1922–1997), English footballer John Marsh (footballer, born 1940), English footballer Jack Marsh (footballer, born 1947) (John William Marsh), English footballer Jackie Marsh (footballer) (John Henry Marsh, born 1948), English footballer
Others John Marsh (died 1688/1689), of Hartford, son-in-law of John Webster John Marsh (1611–1674), of Salem, son-in-law of Samuel Skelton John Marsh (composer) (1752–1828), English composer, diarist and writer John Marsh (minister) (1788–1868), American minister and temperance advocate John Marsh (pioneer) (1799–1856), American pioneer and early California settler John Fitchett Marsh (1818–1880), English solicitor, official and antiquary John Marsh (theologian) (1904–1994) John Marsh (priest) (born 1947), British Anglican clergyman Jon Marsh, musician in The Beloved Jack Marsh (1874–1916), Australian cricketer John Marsh, CFO of ESS Technology