Flintshire (Welsh: Sir y Fflint) is a county in north-east Wales, bordering the English county of Cheshire to the east, Denbighshire to the west and Wrexham County Borough to the south. It is named after the historic county of Flintshire which had notably different borders. Flintshire is considered part of the Welsh Marches and formed part of the historic Earldom of Chester and Flint. The county is governed by Flintshire County Council.

Flintshire takes its name from the former county of Flintshire established in 1536 which existed until 1974 when it was abolished under the Local Government Act 1972. Its re-establishment in 1996 under the Local Government (Wales) Act 1994 does not follow those original boundaries but covers a smaller area.

At the time of the Roman invasion, the area of present-day Flintshire was inhabited by the Deceangli, one of the Celtic tribes in ancient Britain, with the Cornovii to the east and the Ordovices to the west. Lead and silver mine workings are evident in the area, with several sows of lead found bearing the name 'DECEANGI' inscribed in Roman epigraphy. The Deceangli appear to have surrendered to Roman rule with little resistance. Following Roman Britain, and the emergence of various petty kingdoms, the region had been divided into the Hundred of Englefield (Welsh: Cantref Tegeingl), derived from the Latin Deceangli.

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