Hammack is a surname. Notable people with the surname include:
Beth M. Hammack (born 1971/1972), American financial executive Bill Hammack (born 1961), American chemical engineer and professor Bobby Hammack (1922–1990), American musician Caylee Hammack (born 1994), American singer-songwriter Craig Hammack, American special effects supervisor Katherine Hammack (born 1959), American government official Mal Hammack (1933–2004), American college and professional football player William S. Hammack (born 1961), American chemical engineer
See also Ruth Hammack Alexander, American activist