Andrew Scott will star opposite Emily Blunt in Walk the Blue Fields, an adaptation of the Claire Keegan short story of the same name, with Brooklyn's John Crowley directing the drama in Ireland.
US entertainment trade publication Deadline, which first reported the news, says the film's cast also includes Ciarán Hinds and Tom Cullen.
The screenplay is by playwright and director Conor McPherson.
"Walk the Blue Fields follows a woman on her wedding day being confronted with a heart-wrenching decision, as a love triangle from her past threatens to be revealed," says Deadline.
It adds that the Dublin-based Element Pictures and Blunt's company Ledbury Productions are among the producers of the film, with Netflix also on board.
Director Crowley, screenwriter McPherson, and author Keegan are among the executive producers.
Scott was most recently seen in Blue Moon and Wake Up Dead Man: A Knives Out Mystery.
Blunt was most recently seen in The Smashing Machine and will next be seen in The Devil Wears Prada 2.
