County Derry (Contae Dhoire or simply Doire in Irish) is one of the six counties of Northern Ireland, in the province of Ulster. It was named after its main town (later city and administrative centre), Derry The county flower is the Purple Saxifrage.

Unlike the town, historically there was not a preceding County Derry: it was established in 1613 by combining the former County of Coleraine with small parts of Counties Antrim, Donegal, and Tyrone at the behest of the London livery companies and the Irish Society (hence, London-Derry) so that they could control both banks of the mouths of the River Foyle and the River Bann and have access to sufficient wood for construction. The county town was Coleraine.

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