Count Johann Hartwig Ernst von Bernstorff, Danish politician and diplomat (d. 1772)

Count Johann Hartwig Ernst von Bernstorff (German: Johann Hartwig Ernst Graf von Bernstorff; 13 May 1712 – 18 February 1772) was a German-Danish statesman and a member of the Bernstorff noble family of Mecklenburg. He was the son of Joachim Engelke Freiherr von Bernstorff, chamberlain to the Elector of Hanover.