The Critics' Choice Movie Award for Best Supporting Actress is an award given out at the annual Critics' Choice Movie Awards. The awards are presented by the Critics Choice Association (CCA), and were first presented in 1995 with Mira Sorvino being the first recipient for her role in Mighty Aphrodite. There were no official nominees announced until 2001. There have been two ties in this category, and there are currently six nominees annually.

Mighty Aphrodite is a 1995 American comedy film written, directed by, and co-starring Woody Allen, alongside Mira Sorvino, Helena Bonham Carter, Michael Rapaport, and F. Murray Abraham. The screenplay was vaguely inspired by the story of Pygmalion and is about Lenny Weinrib's (Allen) search for his genius adopted son's biological mother, ultimately finding that she is a dim-witted prostitute named Linda Ash (Sorvino).