For the first eleven years of the Academy Awards, directors were allowed to be nominated for multiple films in the same year. However, after the nomination of Michael Curtiz for two films, Angels with Dirty Faces and Four Daughters, at the 11th Academy Awards, the rules were revised so that an individual could only be nominated for one film at each ceremony. That rule has since been amended, although the only director who has received multiple nominations in the same year was Steven Soderbergh for Erin Brockovich and Traffic in 2000, winning the award for the latter. The Academy Awards for Best Director and Best Picture have been very closely linked throughout their history. Of the 91 films that have been awarded Best Picture, 65 have also been awarded Best Director.
In the following table, the years are listed as per Academy convention, and generally correspond to the year of film release in Los Angeles County, California; the ceremonies are always held the following year. For the first five ceremonies, the eligibility period spanned twelve months from August 1 to July 31. For the 6th ceremony held in 1934, the eligibility period lasted from August 1, 1932, to December 31, 1933. Since the 7th ceremony held in 1935, the period of eligibility became the full previous calendar year from January 1 to December 31.