Seapoint is a small seafront area between Blackrock and Monkstown in Dublin in the Dún Laoghaire local authority area. It is best known for its beach and bathing areas, beside a Martello Tower on the Dublin Bay seashore.
The Martello Tower is now the headquarters of the Genealogical Society of Ireland.
The route linking Dún Laoghaire ferryport to the N11 National primary route has itself been designated a National primary route, the N31. Part of the route includes Seapoint Avenue, and the Seapoint area is located on the strip of land, which includes the railway line, between the road and the sea.