Leo Birinski (June 8, 1884 – October 23, 1951) was a playwright, screenwriter and director. He worked in Austria-Hungary, Germany and in the United States. As a playwright in Europe he gained his biggest popularity in 1910 – 1917, then he was forgotten. From the 1920s to 1940s he worked mainly as a screenwriter, first in Germany, later in the USA. In the USA he returned to writing the stage plays. He was writing in German and later on in the USA in English.