Ernst von Possart (11 May 1841 – 8 April 1921) was a German actor and theatre director.
From 1895 until 1905 he was general director of the Bayerische Hoftheater, and in 1901 he opened the Prinzregententheater (Prince Regent's Theatre).
In 1897, in return for Possart assisting him in gaining an orchestral post in Munich, Richard Strauss wrote a recitation for narrator and piano.
On 15 February 1878, Henrik Ibsen wrote him a personal letter commending him on his "genius" performance as "Konsul Bernick" in Ibsens play The Pillars of Society which had its opening date at the Residence Theatre, Munich, 10 days earlier.
He edited German versions of King Lear (1875), The Merchant of Venice (1880), and Coriolanus; wrote the plays Der Deutschfranzösische Krieg (1871), Recht des Herzens (1898), and Im Aussichtswagen (1898); and published Aufgabe der Schauspielkunst (1895), Lehrgang des Schauspielers (1901), and descriptions of many of his own productions.