Amandus Gottfried Adolf Müllner (18 October 1774 – 11 June 1829) was a German critic and dramatic poet.
After studying law at Leipzig he established himself as advocate at Weissenfels and made his debut as an author with the novel Incest, oder der Schutzgeist von Avignon.
With his tragedies, however, Der neun- und-zwanzigste Februar (1812), and especially Die Schuld (1813; publ.
1816), Müllner became the representative of the so-called Schicksalsdramatiker, and for several years fate-tragedies on the model of Die Schuld dominated the German stage.
Notwithstanding his literary success, Müllner did not neglect his profession, and was given the title of Hofrat; he also edited various journals, and had a reputation as a vigorous if somewhat acrimonious critic.