Welsh art is the traditions in the visual arts associated with Wales and its people. Most art found in, or connected with, Wales is essentially a regional variant of the forms and styles of the rest of the British Isles, a very different situation from that of Welsh literature. The term Art in Wales is often used in the absence of a clear sense of what "Welsh art" is, and to include the very large body of work, especially in landscape art, produced by non-Welsh artists in Wales (or with a Welsh subject) since the later 18th century.

Prehistoric Wales has left a number of significant finds: Kendrick's Cave, Llandudno contained the Kendrick's Cave Decorated Horse Jaw, "a decorated horse jaw which is not only the oldest known work of art from Wales but also unique among finds of Ice Age art from Europe", and is now in the British Museum. In 2011 "faint scratchings of a speared reindeer" were found on a cave wall on the Gower Peninsula which probably date to 12,000–14,000 BC, placing them among the earliest art found in Britain. The Mold Gold Cape, also in the British Museum, and Banc Ty'nddôl sun-disc in the National Museum of Wales in Cardiff are likewise some of the most important British works of art from the Bronze Age.

Many works of Iron Age Celtic art have been found in Wales. and the finds from the period shortly before and after the Roman conquest, which reached Wales in AD 74-8, are especially significant. Pieces of metalwork from Llyn Cerrig Bach on Anglesey and other sites exemplify the final stages of La Tène style in the British Isles, and the Capel Garmon Firedog is a spectacular luxury piece of ironwork, among the finest in Europe from the period. The Abergavenny Leopard Cup, from the decades after the conquest, was found in 2003, and shows the presence of imported Roman luxury products in Wales, perhaps belonging to a soldier.

In the Early Medieval period, the Celtic Christianity of Wales participated in the Insular art of the British Isles and a number of illuminated manuscripts possibly of Welsh origin survive, of which the 8th century Hereford Gospels and Lichfield Gospels are the most notable. The 11th century Ricemarch Psalter (now in Dublin) is certainly Welsh, made in St David's, and shows a late Insular style with unusual Viking influence, which is also seen in surviving pieces of metalwork of that period.

There are only fragments of the architecture of the period remaining. Unlike Irish high cross and Pictish stones, early Welsh standing stones mainly employ geometric patterns and words, rather than figure representation; however, 10th century stones represent Christ and various saints. Little metalwork survives from the early period of the 5th–9th centuries in Wales. However, archaeological sites at Dinas Powys have revealed various artifacts such as penannular brooches and other pieces of jewellery. Similar brooches have been discovered a site at Penycorddyn-mawr, near Abergele, dating to the 8th century. During this period, the construction of Holy wells was also particularly commonplace in Wales.

Wales has rarely been very prosperous, and the most striking medieval architecture is military, often built by the Normans and English, especially the famous "Castles and Town Walls of King Edward in Gwynedd" and Beaumaris Castle in Anglesey, recognised as UNESCO World Heritage Sites, Caerphilly Castle and the castles of the Welsh Prince Llywelyn the Great (such as Criccieth Castle and Dolbadarn Castle). There are a number of impressive monastic ruins; Welsh medieval churches are nearly all relatively modest, including the cathedrals. They very often had wall-paintings, panel altarpieces and much other religious art, but as in the rest of Britain very little has survived. Conwy, an English garrison town with its medieval walls almost entirely intact, has a notable example of a 13th-century medieval stone town-house.

Peter Lord suggests that the Renaissance began in Wales around 1400. Much of the art produced in this period was created in or for the church. Strata Florida Abbey, for example, retains some of its medieval decorated tiles.

Despite the widespread destruction that took place during the Reformation and later the Commonwealth, a number of Welsh churches retain fragments of medieval stained glass. These include All Saints' Church, Gresford, St Michael's Church, Caerwys, St Mary's Church, Treuddyn, St Elidan's Church, Llanelidan, Church of St Mary & St Nicholas, Beaumaris, St Gwyddelan's Church, Dolwyddelan, and St David's Cathedral.