Marsham is a surname. Notable people with the surname include:
Dame Joan Marsham (1888–1972), British philanthropist John Marsham (cricketer) (1842–1926), English clergyman and cricketer Robert Marsham (1708–1797), founder of phenology Thomas Marsham (died 1819), English entomologist Walter Marsham (1869–1945), English cricketer, the son of John Marsham
A family of cricketers: Algernon Marsham (1919–2004) C. H. B. Marsham (1879–1928) C. D. B. Marsham (1835–1915) Charles Marsham (1829–1901) George Marsham (1849–1927) Robert Marsham (cricketer) (1833–1913)
The family name of the Earl of Romney and their predecessors the Baronets of Cuckston and Barons Romney: Sir John Marsham, 1st Baronet (1602–1685) Sir Robert Marsham, 4th Baronet (1650–1703) Robert Marsham, 1st Baron Romney (1685–1724) Charles Marsham, 1st Earl of Romney (1744–1811) Charles Marsham, 2nd Earl of Romney (1777–1845) Charles Marsham, 3rd Earl of Romney (1808–1874) Charles Marsham, 4th Earl of Romney (1841–1905) Michael Marsham, 7th Earl of Romney (1910–2004) Julian Marsham, 8th Earl of Romney (born 1948)
See also Marsham, Norfolk Marshman