Hackl is a German surname. Notable people with the surname include:
Anton Hackl (1915–1984), German Luftwaffe pilot
Zeno Otton Hackl (1912–1992), Bosnian and Croatian actor
Christine Stix-Hackl (born 1957), Austrian jurist
David Hackl, film director and production designer
Erich Hackl (born 1954), Austrian novelist
Georg Hackl (born 1966), German luger
Karlheinz Hackl (born 1949), Austrian actor
Raphael Hackl (born 1987), German rugby union international