Afon Tâf High School (Welsh: Ysgol Uwchradd Afon Tâf) is an 11–16 mixed secondary school in Troed-y-rhiw, Merthyr Tydfil, Merthyr Tydfil County Borough, Wales.

Afon Tâf is the Welsh language name of the River Taff which flows past the school.

Built a cost of around £750,000 the school opened in September 1967.

The whole school was renovated between 2014 and 2017, as a cost of £12 million.

The project was undertaken in stages to minimise the impact on the work of the school.