There are many different viewpoints on what makes a film disturbing. For the purpose of this article, "disturbing" can be interpreted to mean simply upsetting or disquieting. It does not necessarily mean that these films are graphically violent or overtly sexual (although many of them are very much so). For instance, Aftermath did not make this list. It is a thirty-odd minute short film depicting the rape and mutilation of a corpse. While certainly a visually upsetting piece, I feel that it lacks the depth to really linger with the viewer.
The following movies do have that extra depth to really get under the viewer's skin. You need to watch the films on this list. You may hate them, but even if you do, you should still see them. Why? Because they are guaranteed to produce a visceral reaction, and any art that is capable of provoking thought and eliciting strong emotions is a significant accomplishment.