Molly Shannon
Mary Katherine Gallagher
Will Ferrell
Sky Corrigan
Elaine Hendrix
Evian Carrie Graham
Harland Williams
Eric Slater
Tom Green
Dylan Schmultz-Plutzker
Mark McKinney
Father Ritley
Jack Newman
Mr. Feinstein
Donna Hanover
Mrs. Corrigan
Dan Redican
Freaky Freddy
Joan Massiah
Crucifix Nun
Jean Howell
Moira McDaniels
Mallory Margel
Little Mary
Aidan Kelly
Thornton Gallagher
Jane Moffat
Sister Eileen
Robert Clark
Little Boy Slater
Joanna Bennett
Student (uncredited)
Spencer Humm
Choral Singer (uncredited)
Fraser McGregor
Bike Boy (uncredited)
Jonathan Gabriel Robbins
Tom, Whose Dad Is Dead (uncredited)
Jason Sehorn
Man in Pink Tutu (uncredited)
Deirdre McCloskey
Rosemary Gallagher