Elsewhere Mike Leigh gets a surprise nomination in the original screenplay category for Another Year.
Mark Boal took the original screenplay prize for Kathryn Bigelow's film chronicling the manhunt for Osama Bin Laden.
Tarantino won the original screenplay prize for Django Unchained, adding to the Oscar he won for writing Pulp Fiction in 1994.
Film fans' favourite Quentin Tarantino also celebrated as he picked up the original screenplay Bafta for his western slavery epic, Django Unchained.
Quentin Tarantino picked up the original screenplay award for "Django Unchained, " and Christoph Waltz was named best supporting actor for playing a loquacious bounty hunter in Tarantino's slave-revenge thriller.
Even as "A Separation" has garnered increasing international acclaim, Iranian authorities have distanced themselves from the movie, which is nominated for Academy Awards in the international film and original screenplay categories.
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AIDS, who also directed the movie and wrote the screenplay, based on his own original novel.
Director Kathryn Bigelow, whose The Hurt Locker won Academy Awards for Best Picture, Best Director, and Best Original Screenplay, tells us the story of the multi-year, global hunt for Osama bin Laden, seen through the eyes of CIA analyst Maya.
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The film earned Campion a best director nomination at the Oscars and she won the Academy Award for best original screenplay.
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Take This Waltz is based on an original screenplay by the director.
Moonrise Kingdom and The Master are among the films nominated for the Writers Guild's original screenplay prize, while Argo, Life of Pi and Lincoln compete for its adapted screenplay honour.
The film is written by Richard Hawkins, whose original screenplay was sent in a brown envelope, unsolicited, to the BBC.
But the film netted nine Oscar nominations, and Damon and Affleck were on the map after winning for best original screenplay.
Unflinching and in French, it was a surprise best-picture nominee, and also received nominations for Haneke's direction, for original screenplay and for the performance of 85-year-old Riva.
The films was also nominated for Best Original Screenplay, Best Directing and Best Picture.
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Her long life may give the 73-year-old Seidler the distinction of being the oldest writer to win an Oscar for an original screenplay.
One of the movie's Oscar nominations is for best original screenplay.
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Best Screenplay (Original) Memento By far the most clever script of the bunch, writer Christopher Nolan tells a fragmented, disoriented story backwards that nevertheless manages to enthrall.
The King's Speech picked up four Oscars at the 83rd Academy Awards, including best picture, best actor, best original screenplay and best director.
Great floods wash away the bonds of family, among other things, in "Beasts of the Southern Wild, " "Life of Pi, " "The Impossible" and "Moonrise Kingdom" (nominated for Best Original Screenplay).
This set's most resonant film is "The Blue Dahlia" (1946), Raymond Chandler's only original screenplay and an Oscar-nominated one at that.
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Jessica Chastain will win the Oscar for Best Actress, and Mark Boal will probably win for Best Original Screenplay.
Christoph Waltz was a bit of a surprise winner in the Best Supporting Actor category for Django Unchained and Quentin Tarantino won for Best Original Screenplay for Django.
Iranian film A Separation, which recently triumphed at the London Critics Circle awards, received two nods, including best foreign language movie and original screenplay.
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