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