Randalstown is a townland and small town in County Antrim, Northern Ireland, between Antrim and Toome. It has a very prominent disused railway viaduct and lies beside Lough Neagh and the Shane's Castle estate. The town is bypassed by the M22 motorway with junctions at both the eastern and western ends of the town. It had a population of 5,151 people in the 2021 census.