Katherine Elaine Soucie (born November 18, 1953)  is an American voice actress. She is sometimes credited as Kath Soucie, Katherine Soucie, Kath Souci, Kath E. Soucie, and Kath Eleanor Soucie.
She has provided several voices for Nickelodeon shows. She voiced Phil, Lil, and Betty DeVille, and Buster and Alisa Carmichael on Rugrats. She would reprise her roles as Phil, Lil, and Betty in all three Rugrats movies and the sequel series, All Grown Up! She also voiced Dusty in Aaahh!!! Real Monsters, Miriam Pataki, Marilyn Berman, Mrs. Vitello, Nancy, and Baby Oskar on Hey Arnold!, Blake Gripling on As Told By Ginger, Betty Quinlan on The Adventures of Jimmy Neutron, Boy Genius, Yadda Yadda Yeti on ChalkZone, XJ-4 and XJ-5 on My Life as a Teenage Robot, Maddie Fenton, The Lunch Lady, and Box Lunch on Danny Phantom. She reprised her roles as Miriam for Hey Arnold!: The Jungle Movie.
Main roles in bold.
- Rugrats: Phil and Lil DeVille; Betty DeVille
- Aaahh!!! Real Monsters: Various roles
- Hey Arnold!: Miriam Pataki
- Oh Yeah! Cartoons: Various roles
- CatDog: Lorraine (1 episode)
- As Told by Ginger: Blake Gripling
- The Adventures of Jimmy Neutron, Boy Genius: Betty Quinlin
- ChalkZone: Yadda Yadda Yeti
- My Life as a Teenage Robot: XJ4; XJ5
- Danny Phantom: Maddie Fenton
- The Loud House: Mrs. Vaporciyan; club manager ("Roadie to Nowhere")
- Wonder Park: Bus Counselor Shannon