
Robert Leffler (9 January 1866 – 15 March 1940) was a German actor, film director and opera singer (bass). Leffler was trained as a singer in Berlin. He began his career in 1889 as a singer and actor at the Basel City Theater, where he stayed until 1891.
Leffler initially appeared primarily as a bass singer at various opera houses such as Nuremberg, Meiningen, Lübeck, Riga, Moscow and Düsseldorf, where he was senior director and opera director at the city theater for 17 years.
From 1919 to 1936 he appeared in 54 films, including the first silent film adaptation of the Buddenbrooks and alongside Hans Albers in several silent films. He also directed 15 films himself.
His older brother Hermann (1864–1929) was also an actor. His brother's wife, his sister-in-law, was the opera singer Martha Leffler-Burkhard (1865–1954).

The Haunted Castle
1921 · as Majordomus

The Expulsion
1923 · as Pfarrer

Only a Dancing Girl
1926

The Golden Abyss
1927 · as Pater Ambrosius, der Missionar

Die Furcht vor dem Weibe
1921

The Blackguard
1925 · as Leidner

The Buddenbrooks
1923 · as Kapitän Kloot

The Old Fritz
1928 · as General Krusemarck

Der Dämon von Kolno
1921

Rosen blühen auf dem Heidegrab
1929 · as Pfarrer

Friedrich Schiller - Eine Dichterjugend
1923 · as Pastor Christoph Moser

The Circle of Death
1922

Schwester Veronica
1927 · as Chefarzt

Der krasse Fuchs
1926 · as Professor Hollerbaum

Crucified Girl
1929

Bismarck 1862 - 1898
1927

Im Schatten des Glücks
1919