Best Actress: 1940s

1940: Margaret Sullavan, The Shop Around the Corner

Oscar winner: Ginger Rogers, Kitty Foyle
Was she nominated?: No
 

1941: Barbara Stanwyck, Ball of Fire

Oscar winner: Joan Fontaine, Suspicion
Was she nominated?: Yes

1942: Veronica Lake, Sullivan's Travels

Oscar winner: Greer Garson, Mrs. Miniver
Was she nominated?: No

1943: Ingrid Bergman, Casablanca

Oscar winner: Jennifer Jones, The Song of Bernadette

Was she nominated?: No (nominated for For Whom the Bell Tolls)

1944: Ingrid Bergman, Gaslight

Oscar winner: Ingrid Bergman, Gaslight

1945: Lauren Bacall, To Have and Have Not

Oscar winner: Joan Crawford, Mildred Pierce
Was she nominated?: No

1946: Ingrid Bergman, Notorious

Oscar winner: Olivia de Havilland, To Each His Own
Was she nominated?: No

1947: Deborah Kerr, Black Narcissus

Oscar winner: Loretta Young, The Farmer's Daughter
Was she nominated?: No

1948: Rita Hayworth, The Lady from Shanghai

Oscar winner: Jane Wyman, Johnny Belinda
Was she nominated?: No

1949: Olivia de Havilland, The Heiress

Oscar winner: Olivia de Havilland, The Heiress