The deal was struck with sales company ContentFilm International, which will announce a US deal for the film soon.
The Works plans a UK and Irish theatrical release on Dec 28. The film has its UK premiere on Oct 21 a the London Film Festival after premiering in Toronto.
The film is a love story set in the present day and in World War II. Shirley MacLaine, Christopher Plummer, Mischa Barton, Brenda Fricker, Neve Campbell and Pete Postlethwaite star.
ContentFilm has previously sold Closing the Ring to territories including Spain (Manga), Japan (Shochiku), Germany (Telemunchen), Australia (Hopscotch), the Netherlands (A-Film), and Canada (Odeon).
Mick Southworth, managing director of The Works UK Distribution, said: 'It is a great honour to represent this terrific picture from Lord Attenborough. We expect Closing The Ring to be particularly successful in cinemas across Ireland where it was filmed.'
Closing The Ring was backed by the Bank Of Ireland, the UK Film Council, Scion, NFTC and Content. Attenborough produced alongside Jo Gilbert.
Meanwhile, The Works has brought on Mervyn Andrews as head of Irish distribution, and Closing the Ring will be the first film release he oversees. The industry veteran has worked for Walt Disney Productions, PolyGram, Redbus, and Lionsgate.
Southworth said: I have known and worked with Mervyn all my business life and there is simply no one better in the industry to lead our distribution activity in Ireland'.