Newbold is both a surname and a given name. Notable people with the name include:
Surname:
- Alf Newbold (1921–2002), English footballer
- Charles Newbold (1764–1835), American inventor
- Ethel Newbold (1882–1933), English epidemiologist and statistician
- Gregory S. Newbold, United States Marine Corps general
- Joshua G. Newbold (1830–1903), Governor of Iowa 1877–78
- Marjory Newbold (1883–1926), Scottish socialist and communist, prominent in the Independent Labour Party and in the 'Red Clydeside' movement
- Soon Hee Newbold (born 1974), Korean born American composer
- Tricia Newbold, American government employee and whistleblower
- Walton Newbold (1888–1943), British Member of Parliament
Given name:
- Newbold Black, American hockey player
- Newbold Morris (1902–1966), American politician and lawyer
- Newbold Noyes Jr. (1918–1997), American publisher, journalist and newspaper editor