Alleyn's School is an Independent school (Other independent school) with a Church of England religious character. The school consists of mixed pupils aged between 4 and 18 and has a capacity of 1340.

This school has strong academic results. It is in the top 10% of Secondary schools in England based on Key Stage 4 GCSE performance and ranking according to the Attainment 8 score (how well pupils of the school have performed in up to 8 qualifications). It is also in the top 10% of Secondary schools in England based on Key Stage 5 (A-Level and equivalent) performance and ranking according to the Average Point Score (how well pupils of the school have performed in their Academic qualifications).