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Most Oscars won - Best Supporting Actress

Most Oscars won - Best Supporting Actress
Who
Shelley Winters, Dianne Wiest
Where
United States
When
1964
The record is shared by two actresses: Shelley Winters won Oscars for her roles in The Diary of Anne Frank (US 1959) and A Patch of Blue (US 1965); and Dianne Wiest won for Hannah And Her Sisters (US 1986) and Bullets Over Broadway (US 1994).  Both of Wiest's roles were in films directed by Woody Allen.