- Aleksandr Mikhaylov
- Sanya Grigoryev
- Olga Zabotkina
- Katya Tatarinova
- Anatoliy Adoskin
- Valya Zhukov
- Evgeniy Lebedev
- Romashov
- Boris Belyayev
- Sanya Grigoryev as a Child
- Lyudmila Bezuglaya
- Katya Tatarinova as a Child
- Boris Arakelov
- Romashka as a Child
- Eduard Kuznetsov
- Valya Zhukov as a Child
- Inna Kondrateva
- Mariya Vasilyevna
- Leonid Gallis
- Headmaster Nikolay Tatarinov
- Bruno Frejndlikh
- Teacher Ivan Korablyov
- Tatyana Pelttser
- Nina Kapitonovna
- Yelena Maksimova
- Aunt Dasha
- Nina Drobysheva
- Sasha
- Mikhail Ladygin
- Navigator
- Konstantin Adashevsky
- Professor
- Lyudmila Lyulko
- Katya's Friend
- Lyudmila Makarova
- Katya's Friend
- Boris Kokovkin
- Colonel
- Valeri Sebekin
- Schoolboy
- Lidiya Fedoseeva-Shukshina
- Zhukov's Assistant
- Vladimir Kurkov
- Zhukov's Assistant
- Vsevolod Kuznetsov
- Pilot
- Ignat Leyrer
- Piloting Instructor
- Valentina Savelyeva
- Cook at the Boarding School
