Hartnell is a surname, and may refer to
- Andy Hartnell, a comic book writer.
- Bryan Hartnell, a victim of the Zodiac Killer.
- Norman Hartnell, an English fashion designer.
- Scott Hartnell, a Canadian professional ice hockey player.
- Tim Hartnell, an Australian journalist.
- William Hartnell, an English actor.
- William Edward Petty Hartnell