Kornauth was born in Olmütz, Moravia. A cellist and pianist from his youth, he went in 1909 to Vienna, where he studied with Robert Fuchs, Guido Adler, Franz Schreker and Franz Schmidt. After teaching music theory at Vienna University from 1919, Kornauth embarked on an international career as pianist, accompanist and conductor that took him to Indonesia and to South America. In 1940 he resumed a teaching career in war-time Vienna and Salzburg. He joined the Nazi-sponsored Reichsmusikkammer, but continued to support his teacher Adler, who was held under house arrest as a Jew, until the latter's death in 1941. In post-war Austria, Kornauth became director of the Salzburg Mozarteum, and was elected to the :de:Österreichischer Kunstsenat|Austrian Arts Senate in 1954. He died in Vienna in 1959. Kornauth composed extensively and won a number of prizes including the Austrian State Prize , the Gustav Mahler Foundation prize, and the Austrian Würdigungspreis. His style was however conventional; when the English composer Humphrey Searle visited Vienna in the 1930s he was displeased to find that the only modern music played by the main orchestras was that of Schmidt "or lesser composers like... Kornauth." Kornauth himself recognised in his 1958 autobiography that " was inherent in my personality." Most of Kornauth's output consists of lieder, chamber music and piano pieces, but there are also five orchestral suites amongst other larger scale pieces. A recording of some of Kornauth's piano works by Jonathan Powell was released by Toccata Classics in 2013.
3 Klavierstücke, Op. 23 ; also for piano 4-hands, Op. 23a
Kleine Suite, Op. 29
4 Klavierstücke, Op. 32 ; also for piano 4-hands, Op. 32a
Präludium und Passacaglia, Op. 43
5 Klavierstücke, Op. 44
3 Canons
;Vocal
6 Lieder for voice and piano, Op. 1 ; Nos. 1, 4 and 6 also for voice and chamber orchestra
Erntelied von anno 1914 for medium voice and piano ; words by Richard Smekal
4 Gesänge for high voice and piano, Op. 8 ; also for voice and chamber orchestra
8 Gesänge nach Richard Smekal for high or medium voice and piano, Op. 12 ; words by Richard Smekal; Nos. 2, 3, 4, 6, 7 and 8 also for voice and chamber orchestra
6 Lieder for medium voice and piano, Op. 21 ; also for voice and chamber orchestra
6 Lieder nach Hermann Hesse for medium voice and piano, Op. 22 ; words by Hermann Hesse; Nos. 1~5 also for voice and chamber orchestra; No. 5 also with string orchestra
Welt der Zyklamen for voice and piano, Op. 24 No. 3
4 Lieder nach Brentano for high voice and piano, Op. 34 ; words by Clemens Brentano; No. 1 also for high voice, solo flute and string orchestra; Nos. 2 and 3 also for voice and chamber orchestra
Schwanenlied for high voice and piano, Op. 34b; words by Clemens Brentano
6 Lieder nach Eichendorff for high voice and piano, Op. 37 ; words by Joseph Freiherr von Eichendorff
8 Lieder nach Eichendorff for medium-high voice and piano, Op. 38 ; words by Joseph Freiherr von Eichendorff; Nos. 4 and 8 also for voice and chamber orchestra
;Choral
Gesang der späten Linden for female chorus and chamber orchestra, Op. 16 ; words by Richard Smekal
Der Abend for female chorus, flute, clarinet and string quartet, Op. 34a ; words by Clemens Brentano