Billy Wilder has both done work as a director AND has won six Oscars{R} during his career, but only two of these were for Best Director. Three more were for Best Screenplay, and one as the producer of the Best Picture Oscar{R}.
Nobody has won more Oscars{R} for Best Director than John Ford, who has won four such awards.
Actress Allison Janney has won six Emmy Awards, four for her performances as White House press secretary C.J. Cregg on "The West Wing (1999-2006).
Might not be all but some of those who won 6 Oscars are: Billy Wilder, Rick Baker, Dennis Muren, Walter M. Scott and Thomas Little.
Mrs. Miniver, All About Eve, Forrest Gump, Chicago, Oliver!, The Godfather: Part II, The Apartment, A Place Under the Sun, A Man for All Seasons, An American in Paris.
Slumdog Millionaire which won 8 Oscars, including Best Picture.
Yankee Doodle Dandy
Three movies have won 11 Oscars: Ben-Hur (1959), Titanic (1997) and The Lord of the Rings: The Return of the King (2003). Only one movie won 10 Oscars: West Side Story (1961). It won 10 Oscars out of 11 nominations (it didn't win for Screenplay), and was the first Best Director winner to have two directors.
Barbra Streisand
It is called The King's Speech.
No One . . .
Slumdog Millionaire which won 8 Oscars, including Best Picture.
Who's Afraid of Virginia Woolf? It won 6 Oscars.
Network
The titanic won 11
West Side Story is the only movie to win 10 Oscars.
Titanic (1997).
patton
Rango
It won 5 Oscars, including Best Picture.
the movie should have won several oscars
The Departed won 4 Oscars, more than any movie that year.