Ortrun Landmann (born 11 May 1937) is a German musicologist.
Landmann was born as daughter of the aircraft designer and university teacher Hermann Landmann [de] in Szczecin.
After her studies and doctorate at the University of Rostock she was a research assistant to the conductors Otmar Suitner and Herbert Blomstedt as well as to the music department of the Saxon State and University Library Dresden.
From 1987 until her retirement, she was head of the Répertoire International des Sources Musicales department at the State Library Dresden.
The focus of her historical musicology work is the music at the Electorate of Saxony court in Dresden and the work of the Staatskapelle Dresden.