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

• Alexander Daniell (1599–1668), Cornish landowner
• Alfred Daniell (1853–1937)
• Ave Daniell (1914–1999), American (gridiron) footballer
• Charles Daniell (1827–1889), Major-General, British Army
• David Daniell (author) (1929–2016), biographer of William Tyndale
• David Daniell (cyclist) (born 1989), English competitive cyclist
• David Daniell (musician) (born 1972), American guitarist and composer
• David Scott Daniell (1906–1965)
• De'Anyers family
• Edward Daniell (cricketer) (1815–1875), English cricketer
• Edward Thomas Daniell (1804–1842), English landscape painter and etcher
• Francis Henry Blackburne Daniell (1845–1921) was an Anglo-Irish barrister and historian
• Geoffrey Daniell (1516–1586)
• George Daniell (medical doctor) (1864–1937), medical practitioner and anaesthesiologist
• George Daniell (photographer) (1911–2002), American photographer
• George Daniell (priest) (1853–1931), English Anglican priest
• Gladys Daniell (1884–1962)
• Harold Daniell (1909–1967), British racing motorcyclist
• Henry Daniell (1894–1963), British actor
• Jim Daniell (1918–1983), American (gridiron) footballer
• John Daniell (cricketer) (1878–1963), English rugby player and Cricketer
• John Daniell (rugby union) (born 1972), New Zealand writer and rugby player
• John Frederic Daniell (1790–1845), British chemist and physicist
• Leaf Daniell (1877–1913)
• Louisa Daniell (1808–1871)
• Madeline Daniell (1832–1906)
• Marcus Daniell (born 1989), New Zealand tennis player
• Martin H. Daniell (born 1935)
• Percy John Daniell (1889–1946), British mathematician
• Sir Peter Daniell MP (1584–1652) see also De'Anyers family
• Robert Daniell (1646–1718), Governor of North Carolina
• Roy Daniell (born 1965)
• Samuel Daniell (1775–1811), English landscape painter
• Thomas Daniell (1749–1840), RA, English landscape painter
• Warren Daniell (1826–1913), US Representative
• William Daniell (died 1604) (1531–1604) was the member of the Parliament of England for Marlborough
• William Daniell (1665–1698) was the member of the Parliament of England for Marlborough
• William Daniell (1769–1837), RA, English landscape and marine painter, and engraver
• William Freeman Daniell (1818–1865), British army surgeon and botanist
• William Swift Daniell (1865–1933), American painter

Other

• Daniell Revenaugh (1934–2021)
• Daniell Smith-Christopher
• Daniell Zeleny (born 1988)

• Daniell cell, an electrochemical cell invented by John Frederick Daniell
• Daniell integral, a generalized form of mathematical integral proposed by Percy Daniell
• Daniell (crater), a lunar crater named after John Frederic Daniell
• Cape Daniell
• Daniell Peninsula
• Lake Daniell