| Susan Hampshire | ... | Katy Carr | |
| Michele Dotrice | ... | Clover Carr | |
| John Welsh | ... | Dr. Carr | |
| Paul Large | ... | Dorry Carr | |
| Elspeth Pairie | ... | Elsie Carr | |
| rest of cast listed alphabetically: | |||
| Margaret Diamond | ... | Miss Jane | |
| Avril Gaynor | ... | Amy Forbes | |
| Nelly Griffiths | ... | Mrs. Nipson | |
| Olivia Johns | ... | Jeannie Riley | |
| Anne Kettle | ... | Lilly Page | |
| Nigel Lambert | ... | Ned Worthington | |
| Jennie Latham | ... | Mary Silver | |
| Mollie Maureen | ... | Susan | |
| Sandra Michaels | ... | Rose Red | |
| Georgina Sibley | ... | Bella Arkwright | |
| Margot Thomas | ... | Mrs. Florence | |
| Delia Walker | ... | Sally Allsop | |
| Hilary Wyce | ... | Alice Gibbons | |
| Episode Crew |
Directed by | |||
| Edward Barnes | |||
Writing credits(in alphabetical order) | ||
| Susan Coolidge | novel "What Katy Did at School" | |
| Constance Cox | writer | |
Produced by | |||
| Dorothea Brooking | .... | producer | |
Cinematography by | |||
| George Gibbings | |||
Film Editing by | |||
| Ted Walter | |||
Production Design by | |||
| Daphne Shortman | |||
Makeup Department | |||
| Jill Summers | .... | makeup supervisor | |
Costume and Wardrobe Department | |||
| Sonia Kerr | .... | costume supervisor | |
| Main series | Episode guide | Full cast and crew |
| Company credits | IMDb TV section | IMDb Family section |