| Henry Winkler | .... Arthur 'Fonzie' Fonzarelli, Arthur 'Fonzie' Fonzarelli / Composer Peter Tchaikovsky, Arthur 'Fonzie' Fonzarelli / Dougie, Spats |
| Marion Ross | .... Marion Cunningham, Marion Cunningham / Eddie's Wife, Marion Cunningham / Lucretia, Ross Marion |
| Tom Bosley | .... Howard Cunningham, Howard Cunningham / Boris, Howard Cunningham / Eddie |
| Erin Moran | .... Joanie Cunningham, Joanie Cunningham / Dancing Girl, Joanie Cunningham Arcola |
| Anson Williams | .... Pretty Boy, Warren 'Potsie' Weber |
| Ron Howard | .... Richard 'Richie' Cunnigham, Richard 'Richie' Cunningham, Richard 'Richie' Cunningham / Asst. DA Cecil Cunningham, Richie Cunningham |
| Don Most | .... Ralph Malph, Ralph Malph / Purvis |
| Al Molinaro | .... Al / Father Anthony Delvecchio, Alfred 'Al' Delvecchio, Alfred 'Al' Delvecchio / Bear / Father Anthony Delvecchio, Alfred 'Al' Delvecchio / Father Anthony Delvecchio, Alfred 'Al' Delvecchio / Igor, Alfred 'Al' Delvecchio / Ivan the butler, Bear, Father An |
| Scott Baio | .... Charles 'Chachi' Arcola, Newsboy |
| Lynda Goodfriend | .... Kim, Lori Beth, Lori Beth / Ginger, Lori Beth Allen, Lori Beth Allen Cunningham |
| Ted McGinley | .... Roger Phillips |
| Cathy Silvers | .... Jenny Piccalo |
| Pat Morita | .... Arnold, Matsuo 'Arnold' Takahashi |
| Beatrice Colen | .... Marsha, Marsha Simms, Waitress |
| Linda Purl | .... Ashley Pfister, Gloria |
| Harris Kal | .... Bobby |
| Crystal Bernard | .... K.C. Cunningham, Mikki |
| Kevin Rodney Sullivan | .... Tommy |
| Billy Warlock | .... Leopold 'Flip' Phillips |
| Heather O'Rourke | .... Heather Pfister |
Sitcom
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