Lothar Mendes (19 May 1894 – 25 February 1974) was a German-born screenwriter and film director. who began his career as an actor in Vienna and Berlin in Max Reinhardt's famous troupe. He went to America in the early 1920s and there he remained until 1933, directing more than a dozen features, mostly frothy comedies, while under contract to Paramount. His films included the last silent film made in America, The Four Feathers (1929) and the murder mystery Payment Deferred (1933) starring British expatriate Charles Laughton.
After Hitler ascended to power, Mendes travelled to Britain in 1934 to work at Gaumont-British Pictures, directing films with Sir Michael Balcon producing. Under that banner, he directed Jew Süss (1934) starring one of Germany's most famous emigre actors, Conrad Veidt. Mendes' Jew Suss is not to be confused with the later Nazi film of the same title (1940) which is a Reich-made, virulently anti-Semitic film that deliberately contorted the exiled German-Jewish writer, Lion Feuchtwanger's original novel of the same name, on which Mendes' film was based. Mendes' 1934 film version of Feuchtwanger's novel received strong notices at the time, and was considered an important and early film in exposing the origins of the violent anti-semitism of the then-newly empowered Nazi Party; in particular, it was praised by Albert Einstein and the Jewish American leader, Rabbi Stephen Wise, who encouraged its distribution in America under the title Power, though the film itself did not attract an audience in Depression America.
In 1936, Mendes directed his best-known film, the H.G. Wells short story, The Man Who Could Work Miracles (1936) starring Sir Ralph Richardson, for which H.G. Well himself co-wrote the adaptation. His last British film was Moonlight Sonata aka The Charmer and starred the aging piano legend Paderewski as himself; it's notable for containing rare performance footage of the legendary pianist, then in exile from his native Nazi-occupied Poland.
By 1941, Mendes had returned to Hollywood where he co-directed the pro-British International Squadron (1941), one of several films on the Eagle Squadron of American pilots who volunteered to fly in the Battle of Britain before the US entered the war. His last feature films were patriotic World War II fare with such stars as Rosalind Russell as a Navy reconnaissance pilot who must fly one more mission before getting married in Flight for Freedom (1943) and Edward G Robinson as a man who may or may not have married a spy in Tampico (1944). He retired from films in 1946, and the remaining decades of his life remain murky. "A competent, dependable director," comments film historian Larry Langman, "he never achieved the critical success in America that came to some of his compatriots." 
From 1926 to 1928, Mendes was married to the British-born silent film actress Dorothy Mackaill who became a star in the early days of Hollywood. The marriage ended in divorce. In 1935, he married Countess Marguerite de Bosdari (better known as Babe Plunket-Greene), former wife of Count Anthony de Bosdari and of David Plunket-Greene.
He was born in Berlin, where he directed his first two films in German. He then went to Hollywood in the United States, where he lived from 1926 until 1933. In 1934, he travelled to London where he joined in the anti-Nazi filmmaking of the British film studios at the time. After returning to Hollywood in the late 1930s, he directed five more studio films, then retired from films in 1946 and returned to London, where he remained until his death in August, 1974.
- The Island of Tears (1923)
- Three Cuckoo Clocks (1926)
- Prince of Tempters (1926)
- A Night of Mystery (1928)
- Interference (1928)
- Paramount on Parade (1930) co-director
- Strangers in Love (1932)
- Luxury Liner (1933)
- Jew Süss aka Power (in US) (1934)
- The Man Who Could Work Miracles (1936)
- Moonlight Sonata (1937)
- Flight for Freedom (1943)
- Tampico (1944)
- The Walls Came Tumbling Down (1946)
- Lothar Mendes profile
- Hans-Michael Bock; Tim Bergfelder (30 December 2009). The concise Cinegraph: encyclopaedia of German cinema. Berghahn Books. p. 319. ISBN 978-1-57181-655-9. Retrieved 10 November 2011.
- Hollywood and Hitler, 1933-1939 (2012) by Thomas Doherty, p. 59
- Destination Hollywood: The Influence of Europeans on American Filmmaking by Larry Langman, p. 79
- The American Mercury, vol. 37, 1936, pg 80