Tonbridge School is a public school (English fee-charging boarding and day school for boys aged 13–18) in Tonbridge, Kent, England, founded in 1553 by Sir Andrew Judde (sometimes spelt Judd). It is a member of the Eton Group and has close links with the Worshipful Company of Skinners, one of the oldest London livery companies.

There are currently around 800 boys in the school, aged between 13 and 18. The school occupies a site of 150 acres (60 hectares) on the edge of Tonbridge, and is largely self-contained, though most of the boarding and day houses are in nearby streets. Since its foundation, the school has been rebuilt twice on the original site. For the academic year 2023/24, Tonbridge charges full boarders up to £16,648 per term and £12,490 per term for day pupils, making it the 4th and 6th most expensive HMC boarding and day school respectively.

The headmaster is James Priory who began his tenure at the school in 2018.

The school is one of only a very few of the ancient public schools not to have turned co-educational, and there are no plans for this to happen.

Tonbridge School was listed in the 2024 edition of The Schools Index as one of the world's best 150 private schools and among top 30 UK senior schools.