Lucy and Katie Day, who have been at the school since Prep 4, have been joined in Year 7 by Heidi and Georgina Skitt.
Commenting on the new intake, Head of Lower School Mrs Simmonds said: “Here at Truro High School we have been lucky enough to teach many pairs of twins over the years. It is often the case that the girls are very different to each other and they enjoy being in an environment where they are very much treated as individuals and allowed, and encouraged, to pursue their own strengths and interests.”