Allt-yr-yn (Welsh: Allt-yr-ynn) is a suburb of the city of Newport, south-east Wales.

Quick Facts Population, OS grid reference ...

Allt-yr-yn
Allt-yr-yn Location within Newport
Population	8,782 (2011 census)[1]
OS grid reference	ST295885
Principal area	Newport
Country	Wales
Sovereign state	United Kingdom
Post town	NEWPORT
Postcode district	NP20
Dialling code	01633 Savoy exchange
Police	Gwent
Fire	South Wales
Ambulance	Welsh
UK Parliament	Newport West
List of places UK Wales Newport 51.59°N 3.02°W / 51.59; -3.02

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Pronounced by English-speaking locals as "Olt-er-reen",^{[clarification needed]} the spelling should include two Ns at the end, as "Allt-yr-ynn". The name means "The slope (allt) of the ash trees (ynn which is the plural of onnen – ash tree)" in Welsh.^{[citation needed]}

Allt-yr-yn forms an electoral ward (district) and coterminous community (parish) of the city. It is mainly residential and contains many large houses built in the early part of the 20th century. Some of the district is built upon the Ridgeway, Newport, with some of the ward offering views of surrounding areas such as Twmbarlwm. The area is governed by Newport City Council.

Towards the City Centre, Allt-yr-yn is home to the offices of Newport City Council, at the Civic Centre, the clock tower of which can be seen for miles around.

University of Wales, Newport had a campus in Allt-yr-yn, serving as the university's Science, IT and Business faculty, before moving to a site with a new £35 million complex on the banks of the River Usk in central Newport. The new campus formally opened in January 2011.^[2] Initially, the new campus housed the Newport Business School and design, film and media elements of the Newport School of Art, Media and Design.

On the west side of Allt-yr-yn heights there is a Local Nature Reserve containing ancient woodland, meadows and five ponds. Between 1934 and the mid-1960s this was home to an open-air swimming baths.^[3] The nature reserve, managed by a volunteer group known as WING – Wildlife in Newport Group, borders the Crumlin Arm of the Monmouthshire and Brecon Canal which runs parallel to the M4 Motorway at Allt-yr-yn. Lock 2 has been restored by volunteers and work has started on lock 3. Lock 1 disappeared under road works in Newport early in the 20th century.^[4]

A permanent military presence was established in the area with the completion of the Cavalry Barracks in 1845.^[5]

There was once a hospital in the ward, but this was deemed surplus to requirements and the site is now the Allt-yr-yn Heights estate.