King of Friday's Men (1948) is an Irish play in three acts by Michael Joseph (M.J.) Molloy and is considered his first masterpiece. The first production was on October 18, 1948, in the Abbey Theatre in Dublin, Ireland.

Marguerite McNamara was an American stage, film, and television actress and model from the United States. McNamara began her career as a teenage fashion model. She first came to public attention as Patty O'Neill in the 1951 national tour of F. Hugh Herbert's The Moon Is Blue which ran concurrently with the original Broadway production. In 1952 she succeeded Barbara Bel Geddes in that role in the Broadway production. Both productions were directed by Otto Preminger, and Preminger also directed McNamara in that role in the controversial 1953 film adaptation of that work. She earned an Academy Award nomination for Best Actress for her role in the film.