- Bing Crosby
- Harvey Howard
- Fabian
- Gil Sparrow
- Tuesday Weld
- Joy Elder
- Nicole Maurey
- Prof. Helene Gauthier
- Richard Beymer
- Bob Bannerman
- Patrick Adiarte
- T.J. Padmanagham
- Jimmy Boyd
- Robert Higgson
- Yvonne Craig
- Randy 'Scoop' Pruitt
- Gavin MacLeod
- Professor Thayer
- Kenneth MacKenna
- President Byrne of Pinehurst
- Nina Shipman
- Laura Howard
- Angus Duncan
- Harvey Howard Jr.
- Gary Armstrong
- Minor Role
- Harold Ayer
- Student
- Jimmy Baya
- Band Leader
- Shirley Blackwell
- Rower
- Carla Borelli
- Harvey Jr.'s Date at Ball
- Harry Carter
- Harvey's Chauffeur
- Alvin Childress
- Guest Announcer at Judge Carter's Ball
- Donald Cockburn
- Basketball Coach
- Dick Crockett
- Bones McKinney
- Douglass Dumbrille
- Judge Carter
- Gregg Dunn
- Bit Role
- Opal Euard
- Mrs. Carter
- Frank Fowler
- Professor
- Don Gazzaniga
- Bit Role
- Richard George
- Student
- Ruby Goodwin
- Dr. Byrne's Maid
- Ray Hamilton
- Laura's Date at Ball
- John Page Harrington
- Heazlett
- Jimmie Horan
- Minor Role
- Linda Hutchings
- Julie Carter - Judge Carter's daughter
- Byron Kane
- Professor
- Jean Paul King
- Professor
- James Lanphier
- Burdick, Maitre D' at Harvey Howard's
- Johnny Lee
- Servant at Judge Carter's Ball
- Mary Patton
- Matron
- Edward T. Peckham
- Professor
- Ray A. Rustigan
- Hedgepeth
- Art Salter
- Gas Station Attendant
- Jeffrey Sayre
- Helps Harvey from Floor at Dance
- Frank J. Scannell
- Auctioneer at College
- Elisabeth Talbot-Martin
- Matron
- Emerson Treacy
- Professor
- Janice Trotter
- Student
- Irene Vernon
- Matron
- Paul von Schreiber
- Crump
- Ernestine Wade
- Judge Carter's Maid
- H.E. West
- Bit Role
