Newbold is both a surname and a given name. Notable people with the name include:
Surname:
Alf Newbold (1921–2002), soccer player
Charles Newbold (b. 1780), inventor
Ethel Newbold (1882–1933), English epidemiologist and statistician
Gregory S. Newbold, U.S. general
Joshua G. Newbold (1830–1903), Governor of Iowa 1877–78
Soon Hee Newbold (1974– ), Korean born American composer
Walton Newbold (1888–1943), British Member of Parliament
Given name:
Newbold Morris, (1902–1966), American politician and lawyer
Newbold Noyes, Jr., (1918–1997), American publisher, journalist and newspaper editor