Academy Award for Best Director

The Academy Award for Best Directing (Best Director), usually known as the Best Director Oscar, is one of the Awards of Merit presented by the Academy of Motion Picture Arts and Sciences (AMPAS). It is given to directors for a movie.
Nominations for Best Director are made by members in the academy's Directing branch. The award winners are selected by the academy membership as a whole.
Winners and nominees.
1920s.
In the first year only, the award was separated into Dramatic Direction and Comedy Direction.
International presence.
As the Academy Awards are based in the United States and are centered on the Hollywood film industry, the majority of Academy Award winners have been Americans. Nonetheless, there is significant international presence at the awards, as evidenced by the following list of winners of the Academy Award for Best Director.
However, no director has won for a film that is entirely in a foreign language.
There have been 20 directors nominated for films entirely or significantly in a foreign (non-English) language.
Ironically, internationally known filmmakers Jean Renoir (for "The Southerner"), Michelangelo Antonioni (for "Blowup") and Louis Malle (for "Atlantic City") were nominated for films that were in English and not their native language.
Nominations for films primarily in English with some scenes (of a notable length) in a foreign language includes:
Several international nominees (regardless of the language used in their respective films) include: