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The Knocklyon Inn
|• Dáil Éireann||Dublin South|
|• EU Parliament||Dublin|
|• Electoral area||Knocklyon|
|Elevation||69 m (226 ft)|
|Time zone||WET (UTC+0)|
|• Summer (DST)||IST (WEST) (UTC-1)|
Knocklyon (Irish: Cnoc Lín) is a suburb of Dublin in Ireland. It is on the southwest of the city, and just north of the foothills of the Dublin Mountains. It is bordered to the south and east by Rathfarnham and Ballyboden, to the north by Templeogue, and to the west by Firhouse and Ballycullen.
The area has been known historically in 14th century scrolls as Cnoclín, literally 'flax mountain'. Until recently, roadsigns in Knocklyon had the incorrect reverse anglicized translation of to mean Lyon's hill or Cnoc Liamhna. The Irish versions on the sign for Knocklyon Road were incorrectly shown as Bóthar Chnoc Liamhna. SDCC have updated their translation based on a recommendations from the commissioned update on Irish placenames.
The M50 motorway divides Knocklyon, with most of the suburb lying on the east of the motorway. Housing estates to the east include Idrone, Beverly, Dargle Wood, Delaford, Knockaire, Orlagh, Templeroan, and Woodfield. To the west of the M50 are estates such as Castlefield Manor, Glenlyon, Glenvara Park, and Woodstown. These are linked to the rest of Knocklyon by a footbridge (known locally as the A-Bridge), and by Junction 12 of the M50 motorway.
The population figure cannot be isolated from published census data as Knocklyon is composed of Firhouse-Knocklyon district electoral division (DED) (population 3,602 in 2011), plus unpublished fractions of Ballyboden DED (5,085), and Firhouse-Ballycullen DED (7,773). 
The Knocklyon Shopping Centre contains a supermarket and other retail outlets. There are also two shopping areas in the Orlagh and Woodstown estates. Both are anchored by a supermarket and have a number of fast food take-aways shops, as well as beauty salons and childcare centres. There are a number of pubs in the area.
Knocklyon has a number of open spaces within the residential estates. The home ground and playing pitches for Ballyboden St. Enda's GAA Club and Knocklyon United Football Club. There is a branch of the Catholic Boy Scouts of Ireland and the South Dublin Model Railway Club, which have their own premises. A division of the St. John Ambulance was established in September 2010 which provides first aid training and services in the community.
St. Colmcille's national school opened in September 1976. The school is one of the largest primary schools in Europe and educates 1,600 students and employs 80 teachers, 23 special needs assistants, and 11 ancillary staff.
The Catholic Parish of Knocklyon was established in October 1974 under the patronage of Saint Colmcille. It is run for the Dublin Archdiocese by the Carmelite Order. The arish church opened in April 1980, with the Iona Pastoral Centre formerly opened in 2000.
The Knocklyon Church of Christ is an autonomous Christian congregation on the Knocklyon Road, near Gaelscoil Chnoc Liamhna.
Knocklyon is served by Dublin Bus routes 15, 49, 65b and 75
- "Elevation data from daftlogic.com". Retrieved 2014-04-30.
- "Knocklyon entry at the official Placenames Database of Ireland.". Retrieved 2010-01-27.
- "South Dublin Streetnames by Pádraig Ó Cearbhaill at Placenames Database of Ireland, page 2." (PDF). Retrieved 2010-01-27.
- "Logainmneacha agus Sráidainmneacha Bhaile Átha Cliath Theas" (PDF).
- Census Mapping Module: South Dublin All-Island Research Observatory. Retrieved: 2014-05-03.
- "South Dublin Model Railway Club - News". www.sdmrc.hobbysites.net.
- "History". St. Colmcille's S.N.S.
- Lyne, Laura (October 7, 2015). "Largest school building in Ireland will facilitate 1,600 students in Knocklyon". Evening Echo.
- Gaelscoil Chnoc Liamhna Dublin.ie. Retrieved: 2012-12-16.
-  Knocklyon News, January 2000.
- "St Colmcille's CS". St Colmcille's CS.
- "Rathfarnham Parish Church of Ireland". www.rathfarnham.dublin.anglican.org.