| The Uncertainty Principle | |
| Director: | Manoel de Oliveira |
| Producer: | Paulo Branco |
| Starring: | Leonor Baldaque |
| Cinematography: | Renato Berta |
| Editing: | Manoel de Oliveira Catherine Krassovsky |
| Runtime: | 133 minutes |
| Country: | Portugal |
| Language: | Portuguese |
The Uncertainty Principle (pt|'''O Princípio da Incerteza''') is a 2002 Portuguese drama film directed by Manoel de Oliveira. It was entered into the 2002 Cannes Film Festival.[1]