The announcement was made Thursday by David Nevins, president of entertainment at Showtime Networks Inc.
"'The Affair' is a beautiful pilot. It is an intense exploration of two marriages and the affair that disrupts them -- with great acting and a very clever, deeply-observed script by the marvelously talented Sarah Treem," Nevins said in a statement.
"Shalom Auslander and Phillip Seymour Hoffman make for a formidable and unusual comedy team. The chance to get one of the truly great actors of our time into a such an incisive and current comedy was totally and completely irresistible."