The film, which is yet to hit United Kingdom cinemas, has been seen as problematic by some in the way it deals with the themes of racism, homophobia and police brutality.
McDormand garnered the honor for Best Actress in a Drama, McDonagh won for Best Screenplay and Rockwell picked up the prize for Best Supporting Actor.
Dark drama "Three Billboards Outside Ebbing, Missouri" was the big victor with four Golden Globes awards on Sunday on a night marked by scathing jokes about sexual harassment and passionate odes to those breaking their silence.
Also nominated for supporting actor are Willem Dafoe for "The Florida Project", Armie Hammer for "Call Me By Your Name", Richard Jenkins for "The Shape of Water" and Sam Rockwell for "Three Billboards Outside Ebbing, Missouri". The film won the "Best Motion Picture" award in the drama category, and sent star Frances McDormand to the stage as victor of the "Best Actress" award in a drama.
She wasn't the only one to highlight the Post-Weinstein era of Hollywood, with host Seth Meyers giving it plenty of attention in his well received monologue, while actresses Barbara Streisand and Natalie Portman drew attention to the lack of female Directors nominated at the awards.
Except maybe for The Marvelous Mrs. Maisel winning best TV comedy.
This is a very dark film Though Three Billboards comes off as a comedy, albeit an unusual one, in trailers and commercials, some might be surprised at just how dark the movie is.
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The news has been awash with stories from the recent Golden Globe Awards - whether it's concerning disgraced directors and actors across Hollywood or women wearing black in solidarity with those who have come forward over sexual misconduct.
"We no longer live in the gaps between the stories", said Elisabeth Moss, who won Best Actress in a Drama Series for her role in 'The Handmaid's Tale.' "We are the story in print and we are writing the story ourselves". Although the Globes have honored the future Best Picture Oscar victor only half the time in the past 10 years, the future Academy Award victor took one of the Globes for Best Motion Picture 10 out of 11 times from 1993-2003.
Claire Foy of "The Crown" will look to repeat her win for best actress in a drama series.
Best TV Drama was awarded to Hulu's The Handmaid's Tale, which also won the award for Best Drama at the 2017 Emmy Awards. Rachel Brosnahan won best actress in a TV series musical or comedy for the recently debuted "The Marvelous Mrs. Maisel". That movie also won four awards, including Best Drama.
The Golden Globes Awards observance is one of the leading nights in entertainment as it makes out and bestows awards the best in both film and television.
If that was a shock to you, the Globes has a history of surprising wins. The Golden Globe Awards ceremony this year, which had celebrities crusading against sexual harassment and gender bias, saw special moments and statements galore.
In the last 10 years, the Globes and Oscars have only chosen the same victor in its best drama/best picture category four times.