Mary Immaculate High School (Welsh: Ysgol Uwchradd Y Fair Ddihalog) is a Roman Catholic comprehensive school located in Wenvoe, Vale of Glamorgan, Wales. Despite being located in the Vale of Glamorgan, the school is administered as part of the Cardiff local education authority and mainly educates children from the city. Close to 40% of its pupils are entitled to free school meals and there is a growing number of non-Catholic families who attend the school as the Catholic population of west Cardiff has changed.