Ysgol Gymraeg Ystalyfera Bro Dur is a Welsh-medium comprehensive school in Neath Port Talbot, Wales.

[1] The school provides education to three to eighteen-year-old pupils in Neath Port Talbot and south Powys from three campuses in Ystalyfera and Port Talbot.

[3] In September 2018 the Bro Dur ('Steel Land') campus opened in Port Talbot,[4] which operates alongside the primary and secondary school campuses in Ystalyfera.

[5] A second Welsh-medium comprehensive campus named Ysgol Gyfun Gymraeg Bro Dur was opened, it is also referred to as Ystalyfera South.

Notable former pupils of Ystalyfera Grammar School and Ysgol Ystalyfera include: