- Erin Moran - Joanie Cunningham
- Ron Howard - Richie Cunningham
- Don Most - Ralph Malph
- Al Molinaro - Al Delvecchio
- Linda Purl - Ashley Pfister
- Linda Purl - Gloria
- Cathy Silvers - Jenny Piccalo
- Scott Baio - Chachi Arcola
- Lynda Goodfriend - Lori Beth Allen
- Richard Moll - Eugene
- Robin Williams - Mork
- Helen Page Camp - Miss Wheaton
- Lyle Waggoner - Frederick Hamilton
- Crystal Bernard - K.C. Cunningham
- Peter Brocco - Mr. Egan
- Kevin Rodney Sullivan - Tommy
- Frank Ashmore - Johnny
- Dave Madden - Jack Whippett
- Frances Bay - Grandma Nussbaum
- Gavan O'Herlihy - Chuck Cunningham
- George Furth - Mr. Pinney
- Cheryl Ladd - Cindy Shea
- Heather O'Rourke - Heather Pfister
- Janis Paige - Angela
- Gino Conforti - Sticky
- Pamela Myers - Mitzi
- Charlene Tilton - Jill Higgins
- Billy Warlock - Flip Phillips
- Bruce Gray - Mr. Hillary
- Bryan O'Byrne - Mr. Carlyle
- Phil Leeds - J. Jackie Silver
- Cliff Emmich - Candy Man
- Pat Morita - Arnold
- Penny Marshall - Laverne DeFazio
- Hank Stohl - Announcer
- Peggy Doyle - Nun
- Michael Byers - Walter Melman
- Tammy O'Rourke - Tammy
- Michael Morgan - Don Mitchell
- Carol Williams - Meralee
- Kathy O'Dare - Lois
- Brian Byers - Biff
- Robert Karvelas - Man
- Betty Kean - Millie
- Lynn Hallowell - Patti Downes
- Tony Brafa - Uncle Bobo
- Cindy Williams - Shirley Feeney
- David L. Lander - Andrew 'Squiggy' Squiggmann
- Cynthia Windham - Teen Student
- Cynthia Windham - Teen at Arnold's
- Marjorie Bennett - Mrs. Harrison
- Marjorie Bennett - Lady
- Misty Rowe - Wendy
- Robert Casper - Customer
- Robert Casper - Orville
- Mary Treen - Miss Prism
- Edward K. Milkis
- Garry Marshall
- Rich Correll
Phil Leeds interpreta a J. Jackie Silver en la serie.
Robin Williams interpreta a Mork en la serie.
Henry Winkler interpreta a Arthur Fonzarelli en la serie.
Tom Bosley interpreta a Howard Cunningham en la serie.
Marion Ross interpreta a Marion Cunningham en la serie.
Scott Baio hace el papel de Chachi Arcola.
Ted McGinley hace el papel de Roger Phillips.
Erin Moran hace el papel de Joanie Cunningham.
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