John Marsh

• John Marsh (MP fl. 1394–1397), MP for Bath
• John Marsh (MP fl. 1414–1421), MP for Bath
• John Allmond Marsh (1894–1952), Canadian Member of Parliament
• John Otho Marsh Jr. (1926–2019), American congressman and Secretary of the Army

• John Marsh (footballer, born 1922) (1922–1997), known as Jack, English footballer
• John Marsh (footballer, born 1940), English footballer
• John Marsh (footballer, born 1947), known as Jack, English footballer
• John Marsh (footballer, born 1948), known as Jackie, English footballer

• 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

• Jonathan Marsh (1621–1672), founding settler of the New Haven Colony, and of Norwalk, Connecticut

{{human name disambiguation|name = Marsh, John}}