A group of women, wearing tops saying "Two women killed every week" and "Dead Women Can't Vote," jumped the barriers outside the Odeon Leicester Square and lay on the red carpet while the movie's stars Meryl Streep, Carey Mulligan, Helena Bonham Carter and Anne-Marie Duff gave interviews.
Other campaigners let off smoke flares in protest to oppose what they claim are government cuts to domestic violence services.
The red carpet was temporarily blocked as some women were escorted away by security guards.
The A-List cast, rather than be annoyed by the protest, said it was exactly what Emmeline Pankurst (played by Streep) would have approved of.
Helena Bonham Carter said: "It's the perfect response to our film, this is exactly what our characters would do."
It's also exactly what the film's producers and backers could have wished for-----a massive burst of publicity to launch the film.