Belsham is a surname. Notable people with the surname include:
Sel Belsham (1930–2016), New Zealand rugby league player Thomas Belsham (1750–1829), English Unitarian minister Ulva Belsham (1921–2011), New Zealand telegraphist and volunteer radio operator Vic Belsham (1925/1926–2006), New Zealand rugby league player and referee William Belsham (1752–1827), English political writer and historian