3rd Earl of Derby may refer to:

• William de Ferrers, 3rd Earl of Derby (died 1190), English nobleman
• Henry IV of England (1367–1413), previously the Earl of Derby, King of England and Lord of Ireland from 1399
• Edward Stanley, 3rd Earl of Derby (c. 1509–1572), English nobleman and politician

This disambiguation page lists articles associated with the title 3rd Earl of Derby.
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