Catherine Janet "Cathy" Cavadini (born April 21, 1961) is an American voice actress and singer who is best known for her voice roles as Tanya Mousekewitz in the 1991 animated western film An American Tail: Fievel Goes West and its CBS animated series Fievel's American Tails in 1992, and as Blossom on the Cartoon Network animated series The Powerpuff Girls from 1998 to 2005.

She provided additional voices in The Little Mermaid, The Lion King, Dinosaur, and Lilo & Stitch.

She also provided additional voices on Darkwing Duck in the episode "Time and Punishment".