Cate Blanchett won only one acting Oscar.
Cate Blanchett . She has received international acclaim and many accolades , including six AACTA Awards , two Academy Awards , three Screen Actors Guild Awards , three Golden Globe Awards , and three BAFTA Awards . Her portrayal of Katharine Hepburn in Martin Scorsese 's 2004 film The Aviator brought her critical acclaim and many accolades , including the Academy Award for Best Actress in a Supporting Role , making her the only actor to win an Oscar for portraying another Oscar-winning actor . In 2013 , she starred as Jasmine Francis in Woody Allen 's Blue Jasmine , for which she won numerous accolades including the Academy Award for Best Actress . She is additionally the only Australian to win two acting Oscars .