Richard Burton as Father Philip Lamont

Linda Blair as Regan MacNeil

Louise Fletcher as Dr. Gene Tuskin

Max von Sydow as Father Lankester Merrin

Kitty Winn as Sharon Spencer

Paul Henreid as The Cardinal

James Earl Jones as Older Kokumo

Ned Beatty as Edwards

Belinda Beatty as Liz

Rose Portillo as Spanish Girl

Barbara Cason as Mrs. Phalor

Tiffany Kinney as Deaf Girl

Joey Green as Young Kokumo

Fiseha Dimetros as Young Monk

Ken Renard as Abbot

Hank Garrett as Conductor

Lorry Goldman as Accident Victim

Bill Grant as Taxi Driver

Shane Butterworth as Gary Tuskin

Joely Adams as Linda Tuskin

Robert Lussier as

Charles Parks as

Richard Paul as Man on the Plane

George Skaff as

Marianne Muellerleile as Patient (uncredited)

Dana Plato as Sandra Phalor (uncredited)

Kelley Karel as Singer (uncredited)

Karen Knapp as Pazuzu (uncredited)