Roath (Welsh: Y Rhath) is a district in the east/north-east of the city of Cardiff, capital of Wales.

It lies just east/north east of the city centre, stretching from Adamsdown in the south to Roath Park in the north. Roath contains the Plasnewydd electoral ward. The name is believed to originate from Irish ráth, 'fort'. Alternatively, it could derive from the name given to the Roman settlement in Cardiff, Ratostabius.

Its main shopping streets are Albany Road, City Road, and Wellfield Road. It is characterised by its several tree-lined avenues and Victorian era terraced streets. Roath houses a very diverse population including a large number of students, being very close to the main university campuses, a large ethnic minority population and many young professionals. Parts of Roath are among the most affluent districts of Cardiff, although subdivision of the large Victorian properties is starting to occur in the areas at the south end of the district.

Its close proximity to the city centre and large number of local amenities makes it known for its very strong sense of community, encouraged largely due to the parks, road layouts, churches, and local post offices and newsagents, therefore Roath a very popular area to live. There are a number of restaurants and public houses, a variety of shops, an outdoor tennis centre and the famous Roath Park making it one of the greenest areas in Cardiff.

Roath Lock is a television production facility in the Porth Teigr area of Cardiff Bay.

The studios house BBC drama productions including Doctor Who, Casualty and Pobol y Cwm. The centre topped out on 20 February 2011 and filming for such productions commenced in autumn of the same year.

The facility is located on a development site known as Porth Teigr, which also includes a proposed 40,000sq ft digital media centre.

The facility has 500 to 600 people working on site.

The successful planning application sought permission for a 300m long, 20,000 square metre building housing studios and offices with a distinctive façade and repeating motifs. It will also have a gothic-style entrance inspired by some of William Burges’ designs at Cardiff Castle and Castell Coch. The planning application showed the building would face the National Assembly’s Tŷ Hywel building and the Atradius building across the water of Roath Basin.

The 175,000 square foot of HD-ready studios were constructed and fitted out within 13 months, marking the quickest BBC build of its size ever.