The students got the chance to explore famous sets from the films - including Diagon Alley.
They also created photographs of themselves riding in the magical flying car from "Harry Potter and the Chamber of Secrets".
'Magical,' 'mid-blowing' and 'the best first week ever' - not what you'd expect to hear from even the most keen Year 7 students. But for pupils at Queens' School in Watford it really was like none other. The children had their first assembly of secondary school on the set of Harry Potter.
Two hundred had the chance to sit at the long banquet tables where cast members including Daniel Radcliffe, Emma Watson and Rupert Grint shot many of their famous scenes.
Students have been reflecting on their most exciting start of term yet - following in the footsteps of Harry Potter. Year 7 pupils from Queens' School in Watford had their first assembly of the school year in the Hogwarts Great Hall, on the set of Harry Potter.