Judith Davis (born 23 April 1955) is an Australian actress known for her work in film, television and theatre. With a career spanning over 40 years she is commended for her versatility and is regarded as one of the finest actresses of her generation with frequent collaborator Woody Allen describing her as "one of the most exciting actresses in the world". She is the recipient of eight AACTA Awards, three Emmy Awards, two BAFTA Awards, two Golden Globe Awards and has twice been nominated for an Academy Award.

Davis is a 1977 graduate of the National Institute of Dramatic Art, where she starred opposite Mel Gibson in Romeo and Juliet. Most of Davis's stage work has been in Australia, including Piaf (1980), Hedda Gabler (1986), Victory (2004) and The Seagull (2011), but she also starred in the 1982 London production of Insignificance, for which she was nominated for the Olivier Award for Best Actress, and the 1989 Los Angeles production of Hapgood. She returned to the National Institute of Dramatic Art in 2017 to direct the play Love and Money.

She went on to win the BAFTA Awards for both Best Actress and Most Promising Newcomer for the 1979 film My Brilliant Career, two AFI Awards as Best Actress for Winter of Our Dreams (1981) and Supporting Actress for Hoodwink (1981), and later went onto receive Academy Award nominations for A Passage to India (1984) and Husbands and Wives (1992). Her other films roles include High Rolling (1977), Who Dares Wins (1982), Heatwave (1983), High Tide (1987), Georgia (1988), Alice (1990), George Sand in Impromptu (1991), Barton Fink (1991), Dark Blood (1993), Absolute Power (1997), Deconstructing Harry (1997), Celebrity (1998), The Man Who Sued God (2001), The Break-up (2006), Anne d'Arpajon in Marie Antoinette (2006), The Eye of the Storm (2011), To Rome With Love (2012), The Young and Prodigious T.S. Spivet (2013) and The Dressmaker (2015).

For her television work, Davis won Emmy Awards for Serving in Silence: The Margarethe Cammermeyer Story (1995), Judy Garland in Life with Judy Garland: Me and My Shadows (2001) and The Starter Wife (2007) and the Golden Globe Award for Best Actress – Miniseries or Television Film for Life with Judy Garland: Me and My Shadows and One Against the Wind (1991). Other television roles include Water Under the Bridge (1980), A Woman Called Golda (1982), A Cooler Climate (1999), Nancy Reagan in The Reagans (2003), Coast to Coast (2003), Sante Kimes in A Little Thing Called Murder (2006), Page Eight (2011) and Hedda Hopper in Feud: Bette and Joan (2017).