Haydon School is a mixed secondary school and sixth form in the Northwood Hills area of the London Borough of Hillingdon, Greater London, for students aged 11 to 18.

[citation needed] It was named after the local family, as was Haydon Hall.

[1] Alice Spencer, Countess of Derby, had the hall built in 1630.

[citation needed] Haydon School has over 500 students in its sixth form.

For notable pupils of St Nicholas Grammar School, see that article.