Krzysztof, a semantics professor and computer hobbyist, is raising his young son, Paweł, to look to science for answers, while Irena, Paweł’s aunt, lives a life rooted in faith. Over the course of one day, both adults are forced to question their belief systems.
Unfortunately the movie Decalogue I is not yet available on HBO Max.
| Directing | Krzysztof Kieślowski | Director |
| Lighting | Józef Trzoch | Lighting Technician |
| Costume & Make-Up | Jolanta Wlodarczyk | Costume Assistant |
| Directing | Teresa Violetta Buhl | First Assistant Director |
| Camera | Jerzy Rudziński | Camera Operator |
| Art | Sławomir Janowski | Assistant Production Design |
| Directing | Dariusz Jabłoński | First Assistant Director |
| Lighting | Jerzy Tomczuk | Lighting Technician |
| Art | Anna Iskierka | Assistant Production Design |
| Costume & Make-Up | Hanna Ćwikło | Costume Design |
| Art | Robert Czesak | Assistant Production Design |
| Art | Dariusz Brus | Props |
| Directing | Olaf Lubaszenko | Assistant Director |
| Camera | Piotr Jaszczuk | Assistant Camera |
| Costume & Make-Up | Helena Tarnacka | Wardrobe Designer |
| Lighting | Krzysztof Koperski | Lighting Technician |
| Writing | Krzysztof Piesiewicz | Screenplay |
| Directing | Dariusz Przychoda | Assistant Director |
| Lighting | Tomasz Gradowski | Lighting Technician |
| Art | Krzysztof Budzyński | Props |
| Costume & Make-Up | Małgorzata Obłoza | Costume Design |
| Lighting | Marek Modzelewski | Lighting Technician |
| Art | Grazyna Tkaczyk | Assistant Production Design |
| Writing | Krzysztof Kieślowski | Screenplay |
| Art | Halina Dobrowolska | Production Design |
| Art | Waldemar Weiss | Construction Foreman |
| Art | Magdalena Dipont | Set Decoration |
| Art | Stefan Witkowski | Props |
| Camera | Andrzej Burchard | Still Photographer |
| Production | Andrzej Buhl | Unit Manager |
| Crew | Janusz Chlebowski | Stunts |
| Production | Włodzimierz Dziatkiewicz | Assistant Production Manager |
| Sound | Małgorzata Krupa | Sound Assistant |
| Sound | Zdzisław Szostak | Conductor |
| Editing | Ewa Smal | Editor |
| Production | Franciszek Szydełko | Production Consultant |
| Directing | Miroslawa Serafin | Script Supervisor |
| Production | Maciej Kalinowski | Production Consultant |
| Crew | Józef Stefański | Stunts |
| Costume & Make-Up | Jolanta Pruszynska | Assistant Makeup Artist |
| Editing | Urszula Reklajtis | Assistant Editor |
| Production | Andrzej Zaczyński | Production Consultant |
| Crew | Robert Brzeziński | Stunts |
| Production | Anna Kowalska | Administration |
| Production | Małgorzata Dedek | Administration |
| Production | Ryszard Chutkowski | Production Manager |
| Production | Robert Brzeziński | Production Consultant |
| Production | Paweł Mantorski | Production Coordinator |
| Production | Anna Sacharczuk | Assistant Production Manager |
| Editing | Henryka Dancygier | Assistant Editor |
| Crew | Tomasz Przybysz | Stunts |
| Crew | Ryszard Janikowski | Stunts |
| Sound | Piotr Pacholski | Sound Technical Supervisor |
| Sound | Małgorzata Jaworska | Sound |
| Production | Bożena Mrówczyńska | Production Secretary |
| Sound | Janina Kurec | Music Consultant |
| Sound | Zbigniew Malecki | Music Producer |
| Sound | Bogusław Nowak | Foley Artist |
| Costume & Make-Up | Dorota Seweryńska | Makeup Artist |
| Art | Mirosław Mentcel | Graphic Designer |
| Production | Włodzimierz Bendych | Production Coordinator |
| Costume & Make-Up | Jadwiga Cichocka | Assistant Makeup Artist |
| Camera | Wiesław Zdort | Director of Photography |
| Sound | Zbigniew Preisner | Music |