St Asaph (Denbigh) was a rural district in the administrative county of Denbighshire from 1894 to 1935. The rural district was formed from the parts of St Asaph Rural Sanitary Districts in Denbighshire. The remainder of the RSD, in Flintshire, became . The district contained ten civil parishes: * * * Bylchau * Cefn * Llanddulas * * Llanfair Talhaearn * Llansannan * * Trefnant St Asaph (Denbigh) Rural District was abolished by a County Review Order in 1935, most becoming part of the new Aled Rural District, and parts going to an enlarged Abergele Urban District.