Robert Marsham (1708–1797) was an English naturalist.
Robert Marsham may also refer to: Sir Robert Marsham, 4th Baronet (1650–1703), English MP for Maidstone Robert Marsham, 1st Baron Romney (1685–1724), formerly 5th Baronet Robert Marsham, 2nd Baron Romney (1712–1793), British peer and patron of the arts Robert Bullock Marsham (1786–1880), English academic, Warden of Merton College, Oxford Robert Marsham (cricketer) (1833–1913), English barrister, magistrate and cricketer