- the text in this section is based on an article in Wikipedia
Geirionydd Rural District was located in the administrative county of Caernarvonshire, Wales from 1894 to 1934.
The rural district was formed from the part of the earlier Llanrwst Rural Sanitary District in Caernarvonshire. It was named after Llyn Geirionydd (the Geirionydd valley). The rural district was abolished by a County Review Order in 1934, becoming part of Nant Conway Rural District.
Parishes
| Parish Name | Type of Parish | Duration | Notes
| | Capel Curig | Civil parish | 1904-1934 | Created 1904 from parts of Gwydir and Llanrhychwyn parishes
| | Dolwyddelan | Parish (ancient), Civil parish | 1894-1934 |
| | Eidda | Township, Civil parish | 1894-1934 |
| | Gwydir | Parish (ancient), Civil parish | 1894-1905 | Lost areas in 1901 to Betws y Coed Urban District, and in 1904 to create Capel Curig parish. Absorbed by Llanrhychwyn in 1905.
| | Llanrhychwyn | Parish (ancient), Civil parish | 1894-1934 | Lost area in 1904 to create Capel Curig parish. Absorbed Gwydir parish in 1905
| | Maenan | Township, Parish (ancient), Civil parish | 1894-1934 |
| | Penmachno | Parish (ancient), Civil parish | 1894-1934 |
| | The Abbey | Extra parochial area, Civil parish | 1894-1934 |
| | Trefriw | Parish (ancient), Civil parish | 1894-1934 |
|
|
