Newcastle is a village in County Wicklow, Ireland. It is situated on the R761 and is about 45 km (28 mi) south of Dublin city. Newcastle had a population of 924 as of the 2016 census. The ancient barony of Newcastle, which surrounds the village, takes its name from the village and its Norman castle.

Dublin Bus is an Irish state-owned bus operator providing services in Dublin. By far the largest bus operator in the city, it carried 145 million passengers in 2023. It is a wholly-owned subsidiary of Córas Iompair Éireann.