Karl Landauer (12 October 1887 – 27 January 1945) was a German psychoanalyst and co-founder of the first Frankfurt Psychoanalytic Institute.
In 1912 he went to Vienna to complete analytic training with Freud and to practice at the psychiatric clinic of Wagner-Jauregg.
He dealt mainly with psychosis and the issues of narcissism and made significant contributions to the psychoanalysis of affect formation.
In February 1944 he was deported to the Bergen-Belsen concentration camp together with his wife and eldest daughter, where he died of starvation in January 1945.
On the occasion of the 100th anniversary of Goethe University, a Stolperstein, (a 'stumbling stone monument'), was laid to commemorate him on 17 October 2014 at Savignystraße 76.