Johnstown (Irish: Baile Eoin) is a small area of Dún Laoghaire–Rathdown, Ireland.

The area of Johnstown is bordered by Cabinteely, Sallynoggin, Ballybrack and Killiney.

Dublin Bus routes 7, 7B, 45A and 111 all stop on Rochestown Avenue and Churchview Road.

[citation needed] Soccer, Gaelic games, and rugby are played in Kilbogget Park.

Cabinteely F.C., Seapoint RFC and Park Celtic FC are also in the area.