The two new Irish recruits join the Oscar-winning actor Adrien Brody, who has also signed up to appear in season four of Peaky Blinders.
"We have a dream team gathered for series four of Peaky Blinders, coming to us for love of the series which is great," said the show's creator and writer, Steven Knight.
Aidan Gillen is best known for his roles in 'Game of Thrones', 'The Wire', and 'Queer as Folk'. And he has already acted alongside Cillian Murphy in the Batman movie, 'The Dark Knight Rises'.
While Charlie Murphy is best known for her role in Love/Hate and has starred in 'Happy Valley' and 'Rebellion'.
"Adrien Brody, Aidan Gillen and Charlie Murphy give us a wealth of talent to work with. And with Tom Hardy and Charlotte Riley returning, we couldn’t have hoped for more," added Steven Knight.