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1.
A film that is made under the following guidelines:

1. Filming must be done on location. Props and sets must not be brought in (if a particular prop is necessary for the story, a location must be chosen where this prop is to be found).
2. The sound must never be produced apart from the images or vice versa. (Music must not be used unless it occurs where the scene is being filmed).
3. The camera must be hand-held. Any movement or immobility attainable in the hand is permitted. (The film must not take place where the camera is standing; filming must take place where the film takes place.)
4. The film must be in colour. Special lighting is not acceptable. (If there is too little light for exposure the scene must be cut or a single lamp be attached to the camera).
5. Optical work and filters are forbidden.
6. The film must not contain superficial action. (Murders, weapons, etc. must not occur.)
7. Temporal and geographical alienation are forbidden. (That is to say that the film takes place here and now.)
8. Genre movies are not acceptable.
9. The final picture must be transferred to the Academy 35mm film, with an aspect ratio of 4:3, that is, not widescreen. (Originally, the requirement was that the film had to be filmed on Academy 35mm film, but the rule was relaxed to allow low-budget productions.)
10. The director must not be credited.

This style was developed by Danish directors Lars von Trier, Thomas Vinterberg, Kristian Levring, and Søren Kragh-Jacobsen.
I finally got to see Lars von Trier's new Dogme 95 flick, it was absolutely brilliant.
by Donnie! April 08, 2005
 
2.
A way of producing a film, that involves natural lighting, no props, superficial action, non-genre based film shot on Academy 35 MM film "invented" by Lars von Trier and Thomas Vinterberg. A REAL film.
"That film seemed kind of strange due to the lack of special effects. Must of been a Dogme 95"
by Eddie December 07, 2004