Llanishen (Welsh: Llanisien, llan church + Isien Saint Isan) is a district and community in the north of Cardiff, Wales.

[1] Llanishen is the home of the former HMRC tax offices, the tallest buildings in north Cardiff and a landmark for miles around.

With fresh water from the Nant Fawr stream, one of the monks, Isan, founded his llan on the site of the modern day Oval Park.

HM Revenue and Customs (HMRC) formerly occupied Ty Glas, an 18-storey tower block (Phase 2), the 11-storey Gleider House (Phase 1), Ty Rhodfa (formerly the Valuation Office Agency)[5] employing more than 2,700 staff on site in 2007[6] and ground floor offices for an enquiry centre or IREC.

[7] The HM Government buildings are due to be demolished and replaced by up to 250 houses, 70 retirement apartments, a care home, employment units, and a health centre.

The current occupants are Marks and Spencer Simply Food, Boots, HomeSense, Starbucks, DW Sports/MiFit and Pets at Home.

In 1943 the United States Army began using the facilities to hold troops and undertake local training, including basic flight in Tiger Cubs.

[10] Since its closure, ROF Cardiff has become the site of major housing developments by George Wimpey (called Parklands), Barratt (Ty Glas Square) and Leadbitter (Llys Enfys.

The site will also host a new public open space, the final element to be constructed (2010), to include a children's play area, sports pitch and community garden.

[13] In 2018, the Orchards were demolished and McCarthy and Stone built an independent living complex called Llys Faith.

Llanishen Reservoir forms the end of a Victorian water supply system stretching from the Brecon Beacons to Cardiff.

There is a public skatepark next to the leisure centre, featuring two quarter-pipes, a jump box, two flat banks, a driveway, a spine, a rail, a wallride and a halfpipe.

The club's former training ground and pitch was located off Usk Road and was sold to a housing developer to fund the new 3G pitch facilities [21] Llanishen's pubs include the Church Inn, believed to be the oldest surviving pub in Cardiff, and the Wolf's Castle.