Knocklyon is a suburb on the southwest of Dublin city, in the foothills of the
Dublin Mountains and immediately south of the
River Dodder. It is bordered to the west by
Firhouse and
Ballycullen, to the east and south by
Rathfarnham and
Ballyboden, and to the north, across the River Dodder, by
Templeogue. Knocklyon was divided when the
M50 motorway was constructed, with most of the suburb today lying east of the motorway.
Housing estates to the east include Idrone, Green Acre Court, Knocklyon Avenue, Beverly, Dargle Wood, Coolamber, Knockcullen, Lansdowne, Delaford, Knockaire in the old Knocklyon townland, whilst Orlagh, Scholarstown Park and
Templeoran are within the townland of Scholarstown. To the west of the M50 are estates such as Castlefield, Glenlyon, Dalriada, Glenvara and Woodstown. The western and eastern portions of the suburb are linked by the Firhouse Road, by the motorway flyover at Junction 12 of the M50, and by a foot bridge close to where the Old Knocklyon Road formerly met Ballycullen Road. == Population ==