Treadwell is an English surname and occasional given name. Notable people with the name include:
Aaron Louis Treadwell (1866–1947), American professor of zoology
Alexander Treadwell (born 1946), American politician from New York
Anthony Treadwell (1922–2003), New Zealand architect, educator and painter
Daniel Treadwell (1791–1872), American inventor
David Treadwell (born 1965), American football placekicker
Demetrius Treadwell (born 1991), American basketball player
Don Treadwell (born 1960), American football coach and player
Elizabeth Treadwell (born 1967), American poet
Frederick Pearson Treadwell (1857–1919), American-Swiss chemist
Geoffrey Treadwell (1892–1967), South African cricket umpire
George Treadwell (1918/9–1967), American jazz trumpeter
Harold Treadwell (1897–1971), African-American baseball pitcher
Jack L. Treadwell (1919–1977), United States Army officer
James Treadwell, British former academic and author of fantasy novels
John Treadwell (1745–1823), American politician from Connecticut
John Treadwell (miner) (1842–1927), Canadian gold miner in Alaska
Johnny Treadwell (1941–2014), American football player
Laquon Treadwell (born 1995), American football wide receiver
Liam Treadwell, English National Hunt jockey
Marc Thomas Treadwell (born 1955), United States district judge
Mead Treadwell (born 1956), American politician from Alaska
Nicholas Treadwell (born 1937), British art dealer and gallery owner
Oscar Treadwell (1926-2006), American jazz radio journalist and presenter
Sophie Treadwell (1885–1970), American playwright and journalist
Timothy Treadwell (1957–2003), American environmentalist
Valentine Treadwell (c. 1813–1888), New York politician
Treadwell Gibbons, Bermudian cricketer
