Hartnell is an English surname. Notable people with this surname include the following:
Andy Hartnell, American comic book writerBryan Calvin Hartnell, victim of the Zodiac Killer in California, 1969Sir Norman Hartnell (1901–1979), English fashion designerScott Hartnell (born 1982), Canadian professional ice hockey playerTim Hartnell (1951–1991), an Australian journalistWilliam Hartnell (1908–1975), English actor who portrayed the First Doctor in the BBC's Doctor WhoWilliam Edward Petty Hartnell otherwise Don Guillermo Arnel (1798–1854), English-born merchant and administrator in California