Ceiriog Rural District

Ceiriog was a rural district in the administrative county of Denbighshire from 1935 to 1974.

The rural district was formed by a County Review Order in 1935 from the merger of Chirk and Llansillin Rural districts. The district was named after the Ceiriog Valley.

The district contained nine civil parishes:
 * Chirk
 * Glyntraian
 * Llanarmon Dyffryn Ceiriog
 * Llanarmon Mynydd Mawr
 * Llangadwaladr
 * Llangedwyn
 * Llanrhaeadr ym Mochnant
 * Llansantffraid Glynceiriog
 * Llansilin

The rural district was abolished in 1974 by the Local Government Act 1972, with its area becoming part of the district of Glyndŵr, one of six districts of Clwyd.