Truro Cathedral School was a Church of England school for boys in Truro, Cornwall. An ancient school refounded in 1549 as the Truro Grammar School, after the establishment of Truro Cathedral in the last quarter of the 19th century it was responsible for educating the cathedral's choristers and became known as the Cathedral School.

Truro is a cathedral city and civil parish in Cornwall, England, United Kingdom. It is Cornwall's county town, sole city and a centre for administration, leisure and retail trading. Its population was 18,766 in the 2011 census. People of Truro can be called Truronians. It grew as a trade centre through its port and as a stannary town for tin mining. It became mainland Britain's southernmost city in 1876, with the founding of the Diocese of Truro. It is home to Cornwall Council, the Royal Cornwall Museum, Truro Cathedral, the Hall for Cornwall and Cornwall's Courts of Justice.