Coordinates: 53°15′28″N 3°26′30″W / 53.2577°N 3.4416°W / 53.2577; -3.4416

St Asaph (English pronunciation: /sənt ˈæsəf/;Welsh: Llanelwy pronounced [ɬanˈɛlʊɨ̯]) is a city and community on the River Elwy in Denbighshire, Wales. In the 2001 Census it had a population of 3,491.

The city of St Asaph is surrounded by countryside and views of the Vale of Clwyd. It is situated close to a number of busy coastal towns such as Rhyl, Prestatyn, Abergele, Colwyn Bay and Llandudno. The historic castles of Denbigh and Rhuddlan are also nearby.

The earliest inhabitants of the vale of Elwy lived in the nearby Paleolithic site of Pontnewydd (Bontnewydd), which was excavated from 1978 by a team from the University of Wales, led by Dr Stephen Aldhouse Green. Teeth and part of a jawbone excavated in 1981 were dated to 225,000 years ago. This site is the most north-western site in Eurasia for remains of early hominids and is considered of international importance. Based on the morphology and age of the teeth, particularly the evidence of tauradontism, the teeth are believed to belong to a group of Neanderthals who hunted game in the vale of Elwy in an interglacial period.