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Los Angeles - The two films - both of which have been highlighted for success at the forthcoming Oscars - have made it into the Best Original Screenplay category, alongside Christopher Nolan's Inception and The Kids Are All Right, written by Lisa Cholodenko and Stuart Blumberg.
Nicole Holofcener's Please Give - about a couple who have troublesome neighbours - rounds off the list.
Among the surprise omissions from the shortlist are highly-praised films Winter's Bone and The King's Speech, both of which did not make the final cut because of strict rules about submission for the awards.
In the Best Adapted Screenplay Category are critically-acclaimed movies 127 Hours - featuring James Franco as self-amputee Aron Ralston - and Facebook Movie The Social Network.
Simon Beaufoy, who wrote 127 Hours with British director Danny Boyle, joked it was difficult to please fellow scriptwriters so he was particularly pleased with the nomination.
He said: "As all writers know, the hardest crowd to please is one's fellow scribes. They know where you took coffee breaks, stole the jokes and where the bodies - or in this case, the hand - are buried.
"So it is a genuine honour to be nominated by the Writer's Guild of America."
Gay comedy drama I Love You Phillip Morris - starring Jim Carrey and Ewan McGregor - has also been nominated, with the list rounded off by Ben Affleck's The Town and the remake of classic movie True Grit.
The awards will be given at ceremonies in Los Angeles and New York on February 5.
The full list of nominees for the 2011 Writers Guild of America Awards:
Original Screenplay:
Black Swan (Mark Heyman and Andres Heinz and John McLaughlin; story by Andres Heinz)
The Fighter (Scott Silver, Paul Tamasy and Eric Johnson; story by Keith Dorrington, Paul Tamasy and Eric Johnson)
Inception (Christopher Nolan)
The Kids Are All Right (Lisa Cholodenko and Stuart Blumberg)
Please Give (Nicole Holofcener)
Adapted Screenplay:
127 Hours (Danny Boyle and Simon Beaufoy)
I Love You Phillip Morris (John Requa and Glenn Ficarra)
The Social Network (Aaron Sorkin)
The Town (Peter Craig, Ben Affleck and Aaron Stockard)
True Grit (Joel Coen and Ethan Coen)
