Denbighshire (Welsh: Sir Ddinbych; [ˈsiːr ˈðɪnbɪx]) is a county in north-east Wales. It is named after the historic county of Denbighshire, but has substantially different borders. Denbighshire has the distinction of being the longest known inhabited part of Wales. Pontnewydd (Bontnewydd-Llanelwy) Palaeolithic site has Neanderthal remains from 225,000 years ago. There are several castles in the region: Denbigh Castle, Rhuddlan Castle, Ruthin Castle, Castell Dinas Bran and Bodelwyddan Castle. One of Britain's smallest cathedrals is at St Asaph, itself one of the smallest cities.

Denbighshire has a length of coast to the north and hill ranges on its eastern, southern and western borders. In the central part, the River Clwyd has created a broad fertile valley. It is primarily a rural county with little industry. Crops are grown in the Vale of Clwyd and cattle and sheep reared in the upland parts. The coast attracts tourists in the summer and hikers frequent the Clwydian Range, which with the upper Dee Valley, is an Area of Outstanding Natural Beauty. Denbigh, Ruthin and Saint Asaph are historic towns. Llangollen hosts the Llangollen International Musical Eisteddfod in July each year.

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