Blackall is a surname. Notable people with the surname include:
Clarence H. Blackall (1857–1942), American architect Emily Lucas Blackall (1832–1892), American writer and philanthropist Frederick Steele Blackall Jr. (1896–1963), American engineer Graham Blackall, American blogger Henry Blackall (1889–1981), Irish lawyer and judge Jasper Blackall (1920–2020), British sailor John Blackall (1771–1860), English physician Ofspring Blackall (1655–1716), English Anglican bishop and theologian Samuel Blackall (1809–1871), Irish soldier and politician Sophie Blackall, Australian artist and illustrator of children's books William Blackall (1876–1941), Australian botanist