According to Deadline.com, the Miss Saigon star is one of nine new cast members joining the acclaimed series.
Pryce has been cast in the role of High Sparrow, "a pious man whose fellow believers have swarmed King’s Landing, ministering to the lowest and decrying the corruption of the highest."
Others joining the fantasy drama include Keisha Castle-Hughes as Obara Sand, Alexander Siddig as Doran Martell, Toby Sebastian as Trystane Martell, Nell Tiger Free as Myrcella Baratheon, DeObia Oparei as Areo Hotah, Enzo Cilenti as Yezzan, Jessica Henwick as Nymeria Sand and Rosabell Laurenti Sellers as Tyene Sand.
"Game of Thrones," which was renewed for a fifth and sixth season, recently picked up 19 Emmy nominations. It has become the most-watched series in the history of HBO.