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 |
| Directing | Aleš Dospiva | First Assistant Director |
| Directing | Andrey Malyukov | First Assistant Director |
| Directing | Zdeňka Slunéčková | Assistant Director |
| Directing | Viktor Karásek | Assistant Director |
| Directing | N. Bilimova | Assistant Director |
| Crew | Marie Hejzlarová | Script |
| Writing | Miloš Macourek | Story |
| Writing | Miloš Macourek | Screenplay |
| Writing | Yakov Kostyukovskiy | Screenplay |
| Writing | Moris Slobodskoy | Screenplay |
| Writing | Oldřich Lipský | Screenplay |
| Crew | Miloš Brož | Dramaturgy |
| Crew | Valeri Karen | Dramaturgy |
| Camera | Jaroslav Kučera | Director of Photography |
| Camera | Jan Němeček | Camera Operator |
| Camera | Oldřich Hubáček | Camera Operator |
| Camera | Pavel Dosoudil | Camera Operator |
| Camera | Karel Hejsek | Camera Operator |
| Camera | Karel Dobřichovský | Camera Operator |
| Camera | Ladislav Chroust | Camera Operator |
| Camera | Jiří Pechar | Assistant Camera |
| Art | Karel Vacek | Production Design |
| Art | Georgy Kolganov | Production Design |
| Art | Jan Sedláček | Assistant Production Design |
| Art | V. Churinov | Set Decoration |
| Art | Josef Müller | Set Decoration |
| Art | Bohuslav Varhaník | Set Decoration |
| Art | Jiří Žůček | Set Decoration |
| Costume & Make-Up | Marina Zaytseva | Costume Design |
| Costume & Make-Up | Vyacheslav Zaytsev | Costume Design |
| Costume & Make-Up | Jan Kropáček | Costume Design |
| Costume & Make-Up | Ludmila Ondráčková | Costumer |
| Costume & Make-Up | Jaroslava Veselá | Costumer |
| Costume & Make-Up | František Čížek | Makeup & Hair |
| Costume & Make-Up | Vlasta Ulbertová | Makeup & Hair |
| Costume & Make-Up | Jaroslav Hruška | Makeup & Hair |
| Editing | Miroslav Hájek | Editor |
| Editing | Magda Hájková | Assistant Editor |
| Sound | Josef Vlček | Sound |
| Sound | Arnold Shargorodsky | Sound |
| Crew | Jaroslav Kučera | Special Effects |
| Crew | Jiří Rumler | Special Effects |
| Crew | Ludvík Malý | Special Effects |
| Crew | Zlatomil Fabinyi | Stunts |
| Crew | František Faust | Stunts |
| Crew | Josef Koch | Stunts |
| Crew | Miloš Novák | Stunts |
| Crew | Jaroslav Šimonka | Stunts |
| Crew | Stanislav Tůma | Stunts |
| Crew | Alexandr Vejsada | Stunts |
| Production | Lev Kushelevich | Production Manager |
| Production | Jaromír Lukáš | Production Manager |
| Production | Milana Melcerová | Unit Production Manager |
| Production | Miroslav Dousek | Unit Production Manager |
| Production | Jiří Synek | Assistant Production Manager |
| Camera | Dagmar Vrbovcová | Clapper Loader |
| Camera | Jan Kuděla | Still Photographer |
| Sound | Vlastimil Hála | Original Music Composer |
| Sound | Štěpán Koníček | Conductor |
| Sound | František Belfín | Conductor |
| Writing | Mikhail Ancharov | Lyricist |
| Sound | Jiří Korn | Vocals |
| Crew | P. Grodnitsky | Choreographer |
| Writing | Miloš Brož | Creative Producer |
| Directing | Andrei Razumovsky | First Assistant Director |