Rush, officially An Ros, is a small seaside commuter town in Fingal, County Dublin, Ireland. Rush lies on the Irish Sea coast, between Skerries and Lusk, and has a small harbour. It had a population at the 2022 census of 10,875.

Fingal is a county in Ireland. It is in the province of Leinster and is part of the Eastern and Midland Region. It is one of three successor counties to County Dublin, which was disestablished for administrative purposes in 1994. Its name is derived from the medieval territory of Scandinavian foreigners that settled in the area. Fingal County Council is the local authority for the county. In 2022 the population of the county was 330,506, making it the second most populated council in Dublin and the third most populous county in the state.