Christopher Knight
— Studs Lonigan
Frank Gorshin
— Kenny Killarney
Venetia Stevenson
— Lucy Scanlon
Carolyn Craig
— Catherine Banahan
Jack Nicholson
— Weary Reilly
Robert Casper
— Paulie Haggerty
Dick Foran
— Patrick Lonigan
Katherine Squire
— Mrs. Lonigan
Jay C. Flippen
— Father Gilhooey
Josie Lloyd
— New Year's Eve Party Girl (uncredited)