Derby School was a school in Derby in the English Midlands. It had an almost continuous history of education of over eight centuries. For most of that time it was a grammar school for boys. The school became co-educational and comprehensive in 1974 and was closed in 1989. In 1994 a new independent school called Derby Grammar School for boys was founded.

The school was re-founded in the 12th century by a local magnate, Walkelin de Derby (also called Walkelin de Ferrieres, or de Ferrers) and his wife, Goda de Toeni, who gave their own house to an Augustinian priory called Darley Abbey to be used for the school. Local legend has it that it was the second oldest school in England. However, there is no firm information as to the site of the original school.

While Derby School was in existence almost continuously for more than eight centuries, it was closed for a few years as a result of the Dissolution of the Monasteries

Following the extinction of Darley Abbey, on 21 May 1554, Queen Mary I by a Royal Charter, and in return for a payment of £260 13s 4d, granted the corporation of Derby several properties and endowments which had belonged to Darley Abbey, the College of All Saints, St Michael's Church, and some other suppressed chantries and gilds, for the foundation of "a Free Grammar School, for the instruction and education of boys and youths in the said town of Derby for ever to be maintained by the Bailiffs and Burgesses of the same town.
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