Ford won a total of six Academy Awards. Four of these were for Best Director for The Informer (1935), The Grapes of Wrath (1940), How Green Was My Valley (1941), and The Quiet Man (1952)—none of them Westerns (also starring in the last two was Maureen O'Hara, "his favorite actress"). He was also nominated as Best Director for Stagecoach (1939). To this day Ford holds the record for winning the most Best Director Oscars, having won the award on four occasions.

William Wyler Wyler is the most nominated director in Academy Awards history with 12 nominations. In addition to that, Wyler has the distinction of having won the Academy Award for Best Direction on three occasions, for his direction of Ben-Hur, The Best Years of Our Lives, and Mrs. Miniver. Wyler also has the distinction of having directed more actors to Oscar-nominated performances than any other director in history: thirty-six. Out of these nominees, fourteen went on to win Oscars.

Capra won six Academy Awards. He was nominated six times for Best Director and seven times for Outstanding Production/Best Picture. Out of six nominations for Best Director, Capra received the award three times.

Spielberg has won three Academy Awards. He has been nominated for seven Academy Awards for the category of Best Director, winning two of them (Schindler's List and Saving Private Ryan), and ten of the films he directed were up for the Best Picture Oscar (Schindler's List won).

More Info: en.wikipedia.org