Blalock, meaning "dark-haired person" (Middle English Blakelok), is an English surname. It may refer to:
Alfred Blalock (1899–1964), American innovator in the field of medical science Bradley Blalock (born 2000), American baseball player Hank Blalock (born 1980), American baseball third baseman Hubert M. Blalock Jr. (1926–1991), American sociologist Jane Blalock (born 1945), American professional golfer Joe Blalock (1919–1974), American football player Jolene Blalock (born 1975), American actress Justin Blalock (born 1983), American football offensive guard Malinda Blalock (–), female soldier during the American Civil War Patricia Swift Blalock (1914–2011), American librarian, social worker, and civil rights activist Will Blalock (born 1983), American basketball player
See also Blaylock Blelloch