Malachi Pearson
Casper (voice)

Christina Ricci
Kathleen 'Kat' Harvey

Bill Pullman
Dr. James Harvey

Cathy Moriarty
Carrigan Crittenden

Eric Idle
Paul 'Dibbs' Plutzker

Joe Alaskey
Stinkie (voice)

Joe Nipote
Stretch (voice)

Brad Garrett
Fatso (voice)

Devon Sawa
Casper on Screen

Dan Aykroyd
Dr. Raymond Stantz (uncredited)

Chauncey Leopardi
Nicky

Spencer Vrooman
Andreas

Garette Ratliff Henson
Vic DePhillippi

Jessica Wesson
Amber Whitmire

Amy Brenneman
Amelia Harvey

Ben Stein
Mr. Rugg

Don Novello
Father Guido Sarducci

Terry Murphy
Terry Murphy ('Hard Copy')

Ernestine Mercer
Woman Being Interviewed

Doug Bruckner
Reporter (voice)