- Randi Kiger
- Heidi
- Vic Perrin
- Grandfather / The Doctor / Postman (voice)
- Billy Whitaker
- Peter
- Janet Waldo
- Dete
- Michele Laurita
- Clara
- Jacquelyn Hyde
- Miss Rottenmeir
- Barney Phillips
- Father / Mr. Kaehlin (voice)
- Alan Reed
- Sebastian / Mr. Usher (voice)
- Lurene Tuttle
- Clara's Grandmother
- Irene Tedrow
- Granny
- Julie McWhirter
- Neighbor Lady / Peter's Mother (voice)
- Jack Angel
- Various
- Keiko Han
- Clara
- Hisako Kyôda
- Miss Rottenmeier
- Hiroko Maruyama
- Peter
- Ken Sansom
- Various
- Mitsuo Senda
- Johann
- Kazuko Sugiyama
- Heidi
- Dick Van Patten
- Various
