Raheny is a northern suburb of Dublin, Ireland, halfway from the city centre to Howth. It is centred on a historic settlement, first documented in 570 AD. The district shares Dublin's two largest municipal parks, Saint Anne's Park and Bull Island with its 4.5 km beach, with neighbouring Clontarf, and is crossed by several small watercourses. The coastal hamlet grew rapidly in the 20th century and is now a mid-density, chiefly residential, Northside suburb with a village core.