To Moscow have arrived the participants of the international conference of the zoophilologists and also the international jury which is to elect for the world festival the best performance of the program of Moscow circus. Mrs Whistler (Iva Janzurová), British associate professor, makes her understood with the animals in their language but the Czech professor Ruzicka (Jirí Sovák), though he is capable of using the animals language, prefers teaching the animals the human language. Ruzicka's friend, the poodle Archibald, speaks "in Human" very well. The scientific dispute ends with a bet - if Ruzicka teaches the circus elephant to sing, Mrs Whistler will eat up her hat.
Unfortunately the movie Circus in the Circus is not yet available on HBO Max.
| Directing | Oldřich Lipský | Director |
| Writing | Yakov Kostyukovskiy | Screenplay |
| Crew | Marie Hejzlarová | Script |
| Writing | Oldřich Lipský | Screenplay |
| Crew | Miloš Brož | Dramaturgy |
| Directing | Zdeňka Slunéčková | Assistant Director |
| Directing | Andrey Malyukov | First Assistant Director |
| Writing | Moris Slobodskoy | Screenplay |
| Directing | Viktor Karásek | Assistant Director |
| Camera | Oldřich Hubáček | Camera Operator |
| Art | Karel Vacek | Production Design |
| Art | Bohuslav Varhaník | Set Decoration |
| Art | Jiří Žůček | Set Decoration |
| Costume & Make-Up | Ludmila Ondráčková | Costumer |
| Costume & Make-Up | František Čížek | Makeup & Hair |
| Crew | Valeri Karen | Dramaturgy |
| Camera | Jan Němeček | Camera Operator |
| Costume & Make-Up | Marina Zaytseva | Costume Design |
| Directing | Aleš Dospiva | First Assistant Director |
| Writing | Miloš Macourek | Screenplay |
| Art | Jan Sedláček | Assistant Production Design |
| Directing | N. Bilimova | Assistant Director |
| Writing | Miloš Macourek | Story |
| Costume & Make-Up | Jaroslava Veselá | Costumer |
| Camera | Karel Dobřichovský | Camera Operator |
| Art | V. Churinov | Set Decoration |
| Camera | Jiří Pechar | Assistant Camera |
| Costume & Make-Up | Jan Kropáček | Costume Design |
| Camera | Jaroslav Kučera | Director of Photography |
| Camera | Karel Hejsek | Camera Operator |
| Camera | Ladislav Chroust | Camera Operator |
| Camera | Pavel Dosoudil | Camera Operator |
| Art | Josef Müller | Set Decoration |
| Sound | Arnold Shargorodsky | Sound |
| Art | Georgy Kolganov | Production Design |
| Costume & Make-Up | Vyacheslav Zaytsev | Costume Design |
| Sound | Josef Vlček | Sound |
| Editing | Magda Hájková | Assistant Editor |
| Crew | Ludvík Malý | Special Effects |
| Crew | Miloš Novák | Stunts |
| Production | Milana Melcerová | Unit Production Manager |
| Camera | Jan Kuděla | Still Photographer |
| Sound | Štěpán Koníček | Conductor |
| Production | Jiří Synek | Assistant Production Manager |
| Editing | Miroslav Hájek | Editor |
| Sound | Vlastimil Hála | Original Music Composer |
| Production | Jaromír Lukáš | Production Manager |
| Crew | Jiří Rumler | Special Effects |
| Crew | Alexandr Vejsada | Stunts |
| Crew | Zlatomil Fabinyi | Stunts |
| Crew | Stanislav Tůma | Stunts |
| Production | Lev Kushelevich | Production Manager |
| Crew | Josef Koch | Stunts |
| Crew | Jaroslav Šimonka | Stunts |
| Camera | Dagmar Vrbovcová | Clapper Loader |
| Costume & Make-Up | Vlasta Ulbertová | Makeup & Hair |
| Production | Miroslav Dousek | Unit Production Manager |
| Crew | Jaroslav Kučera | Special Effects |
| Crew | František Faust | Stunts |
| Costume & Make-Up | Jaroslav Hruška | Makeup & Hair |
| Sound | František Belfín | Conductor |
| Sound | Jiří Korn | Vocals |
| Writing | Mikhail Ancharov | Lyricist |
| Crew | P. Grodnitsky | Choreographer |
| Writing | Miloš Brož | Creative Producer |
| Directing | Andrei Razumovsky | First Assistant Director |