Leopold Wlach (9 September 1902 – 7 May 1956) was an Austrian clarinetist and clarinet teacher.
While still a student, he participated as bass clarinettist in the 1924 premiere of Anton Webern's Six Songs after Poems by Georg Trakl.
[3] As a result of the emigration of his former teacher and orchestral colleague Viktor Polatschek to the United States, Wlach switched to the solo clarinet and took over his teaching position at the Vienna Music Academy in 1931.
[4] In the same year, the clarinettist suffered a heart attack and, according to his pupil Alfred Prinz, was "no longer fit for duty".
[6] Prinz then replaced Wlach in the "Bläservereinigung" and, after winning an audition, succeeded him as principal clarinettist of the Vienna Philharmonic.