18 women have won multiple Oscars for Best Actress and/or Best Supporting Actress. Katharine Hepburn has won four. All were for Best Actress: Morning Glory in 1932/33; Guess Who’s Coming to Dinner in 1967, The Lion in Winter in 1968; and On Golden Pond in 1981. Ingrid Bergman has won three. The other 16 women have each won two: Bette Davis, Olivia de Havilland, Sally Field, Jane Fonda, Jodie Foster, Helen Hayes, Glenda Jackson, Jessica Lange, Vivien Leigh, Luise Rainer, Maggie Smith, Meryl Streep, Hilary Swank, Elizabeth Taylor, Dianne Wiest and Shelley Winters.
Only two men have won more than two Oscars for acting, but 19 have won at least two. Walter Brennan and Jack Nicholson have each won three Oscars. The others who have won two Academy Awards are: Marlon Brando, Michael Caine, Gary Cooper, Daniel Day-Lewis, Robert De Niro, Melvyn Douglas, Gene Hackman, Tom Hanks, Dustin Hoffman, Jack Lemmon, Sean Penn, Anthony Quinn, Jason Robards, Kevin Spacey, Spencer Tracy, Peter Ustinov and Denzel Washington.
Here’s more information on Academy Awards for Actors and Actresses and Academy Awards for Supporting Actors and Actresses.