I have viewed the films in bold.
1927-28 Janet Gaynor – Seventh Heaven
1928-29 Mary Pickford – Coquette
1929-30 Norma Shearer – The Divorcee
1930-31 Marie Dressler – Min and Bill
1931-32 Helen Hayes – The Sin of Madelon Claudet
1932-33 Katharine Hepburn – Morning Glory
1934 Claudette Colbert – It Happened One Night
1935 Bette Davis – Dangerous
1936 Luise Rainer – The Great Ziegfeld
1937 Luise Rainer – The Good Earth
1938 Bette Davis – Jezebel
1939 Vivien Leigh – Gone with the Wind
1940 Ginger Rogers – Kitty Foyle
1941 Joan Fontaine – Suspicion
1942 Greer Garson – Mrs. Miniver
1943 Jennifer Jones – The Song of Bernadette
1944 Ingrid Bergman – Gaslight
1945 Joan Crawford – Mildred Pierce
1946 Olivia de Havilland – To Each His Own
1947 Loretta Young – The Farmer’s Daughter
1948 Jane Wyman – Johnny Belinda
1949 Olivia de Havilland – The Heiress
1950 Judy Holliday – Born Yesterday
1951 Vivien Leigh – A Streetcar Named Desire
1952 Shirley Booth – Come Back, Little Sheba
1953 Audrey Hepburn – Roman Holiday
1954 Grace Kelly – The Country Girl
1955 Anna Magnani – The Rose Tattoo
1956 Ingrid Bergman – Anastasia
1957 Joanne Woodward – The Three Faces of Eve
1958 Susan Hayward – I Want to Live!
1959 Simone Signoret – Room at the Top
1960 Elizabeth Taylor – Butterfield 8
1961 Sophia Loren – Two Women
1962 Anne Bancroft – The Miracle Worker
1963 Patricia Neal – Hud as Alma Brown
Leslie Caron – The L-Shaped Room
1964 Julie Andrews – Mary Poppins
1965 Julie Christie – Darling
1966 Elizabeth Taylor – Who’s Afraid of Virginia Woolf?
1967 Katharine Hepburn – Guess Who’s Coming to Dinner
1968 Katharine Hepburn – The Lion in Winter
(tied with) Barbra Streisand – Funny Girl
1969 Maggie Smith – The Prime of Miss Jean Brodie
1970 Glenda Jackson – Women in Love
1971 Jane Fonda – Klute
1972 Liza Minnelli – Cabaret
1973 Glenda Jackson – A Touch of Class
1974 Ellen Burstyn – Alice Doesn’t Live Here Anymore
1975 Louise Fletcher – One Flew Over the Cuckoo’s Nest
1976 Faye Dunaway – Network
1977 Diane Keaton – Annie Hall
1978 Jane Fonda – Coming Home
1979 Sally Field – Norma Rae
1980 Sissy Spacek – Coal Miner’s Daughter
1981 Katharine Hepburn – On Golden Pond
1982 Meryl Streep – Sophie’s Choice
1983 Shirley MacLaine – Terms of Endearment
1984 Sally Field – Places in the Heart
1985 Geraldine Page – The Trip to Bountiful
1986 Marlee Matlin – Children of a Lesser God
1987 Cher – Moonstruck
1988 Jodie Foster – The Accused
1989 Jessica Tandy – Driving Miss Daisy
1990 Kathy Bates – Misery
1991 Jodie Foster – The Silence of the Lambs
1992 Emma Thompson – Howards End
1993 Holly Hunter – The Piano
1994 Jessica Lange – Blue Sky
1995 Susan Sarandon – Dead Man Walking
1996 Frances McDormand – Fargo
1997 Helen Hunt – As Good as It Gets
1998 Gwyneth Paltrow – Shakespeare in Love
1999 Hilary Swank – Boys Don’t Cry
2000 Julia Roberts – Erin Brockovich
2001 Halle Berry – Monster’s Ball
2002 Nicole Kidman – The Hours
2003 Charlize Theron – Monster
2004 Hilary Swank – Million Dollar Baby
2005 Reese Witherspoon – Walk the Line
2006 Helen Mirren – The Queen
2007 Marion Cotillard – La Vie en Rose
2008 Kate Winslet – The Reader
2009 Sandra Bullock – The Blind Side
2010 Natalie Portman – Black Swan
2011 Meryl Streep – The Iron Lady
