County Wicklow is a county in Ireland. The last of the traditional 32 counties, having been formed as late as 1606, it is part of the Eastern and Midland Region and the province of Leinster. It is bordered by the Irish Sea to the east and the counties of Wexford to the south, Carlow to the southwest, Kildare to the west, and South Dublin and Dún Laoghaire–Rathdown to the north.

Leinster is one of the four provinces of Ireland, in the southeast of Ireland.