Edwin Justus Mayer (November 8, 1896 – September 11, 1960) was an American screenwriter. He wrote or co-wrote the screenplays for 47 films between 1927 and 1958. Edwin Justus Mayer worked on many screenplays but he is remembered now for his work with Ernst Lubitsch. He worked with Lubitsch on the scripts for To Be or Not to Be (1942) and A Royal Scandal (1945). A Royal Scandal (1945) did poorly at the box office, but is considered by many as one of Lubitsch's finest films.