Johnstown (Irish: Baile Eoin)[2] is a village in County Kildare, Ireland.

The church was a satellite of St. John's (Hospitaller) Priory in Kilmainham, Dublin.

The church is famous for the grave of the Earl of Mayo, the viceroy, who was killed in India in 1872.

The main road eventually bypassed Johnstown in 1964 when the Naas dual carriageway was finished.

This was enlarged into the 6-lane N7 road from Dublin to Johnstown, after which it reduces to the 4-lane M7 motorway that runs towards Limerick.