Donkin is a surname. Notable people with the surname include:

• Billy Donkin (1900–1974), British footballer
• Bryan Donkin (1768–1855), British engineer, inventor and industrialist
• Bryan Donkin (physician) (1842–1927), British physician
• George Donkin (1892–1927), English footballer
• John Donkin (1802–1854), British engineer
• Dylan Donkin (21st century), American musician
• Mike Donkin (1951–2007), English reporter and journalist
• Nance Donkin (1915–2008), children's writer and journalist
• Peter Langloh Donkin (1913–2000), Air Commodore
• Robin Donkin (1928–2006), British historian and geographer
• Rufane Shaw Donkin (1773–1841), British soldier
• Sydney Donkin (1871–1952), British engineer
• William Fishburn Donkin (1814–1869), professor of astronomy at Oxford