Reza's play, described as a satire, will open at London's Gielgud Theatre on March 25, 2008, following previews that begin March 7.
Like Reza's Art, The God of Carnage will be directed by Matthew Warchus with a translation by Christopher Hampton. David Pugh and Daffyd Rogers produce.
According to Rogers, God of Carnage is a comedy about parenting skills. The plot centers on two middle-class couples each of whom have a nine-year-old son. Fiennes plays the lawyer father of a boy who attacks the other couple's son. All four parents get together to discuss what happened.
Stott was in the original cast of Reza's Art with Albert Finney and Tom Courtenay. His previous West End performance was with Richard Griffiths and John Hurt in Heroes, by another French writer, Gerald Sibleyras.
Reza's other credits include Life X 3 and Conversations After a Burial.