List of Sites of Special Scientific Interest in Clwyd

This is a list of the Sites of Special Scientific Interest (SSSIs) in the Clwyd Area of Search. For SSSIs elsewhere in Wales, see List of SSSIs by Area of Search.

* Afon Dyfrdwy (River Dee)
* Alyn Valley Woods and Alyn Gorge Caves
* Berwyn
* Blaen y Wergloedd Bog
* Bryn Alyn
* Bryn Euryn
* Buckley Claypits and Commons
* Caeau Pen-y-coed
* Caerwys Tufa
* Cefn Meadow
* Cefn Rofft
* Chwarel Pant Glas
* Chwarel Singret
* Cil-y-groeslwyd Woods, Eyarth Woods & Rocks & Craig Adwy-wynt
* Clogau Quarry
* Cloy Brook Pastures
* Coed Llys-Aled
* Coed Nant Mawr
* Coed Nant-y-merddyn-uchaf
* Coed Talon Marsh
* Coed Trefraith
* Coed y Gopa
* Coedydd ac Ogofau Elwy a Meirchion
* Coedydd Derw Elwy
* Coedydd Dyffryn Alwen
* Comin Helygain a Glaswelltiroedd Treffynnon/Halkyn Common and Hollywel
* Connah's Quay Ponds and Woodland
* Corsydd Nug a Merddwr
* Crest Mawr Wood
* Cynwyd Forest Quarry
* Ddol Uchaf
* Dee Estuary / Aber Afon Dyfrdwy
* Dinas Bran
* Fenn's, Whixall, Bettisfield, Wem and Cadney Mosses
* Ffynnon Beuno and Cae Gwyn Caves
* Garth-eryr
* Gatewen Marsh
* Graig Fawr
* Graig Quarry
* Graig, Llanarmon-yn-Ial
* Gronant Dunes and Talacre Warren
* Hanmer Mere
* Hendre Bach
* Hendre, Llangedwyn
* Herward Smithy
* Inner Marsh Farm
* Llanddulas Limestone and Gwrych Castle Wood
* Llandegla Moor
* Llay Bog
* Llwyn
* Llyn Bedydd
* Llyn Creiniog
* Llyn Ty'n y Llyn
* Llyn y Fawnog
* Maes Hiraddug
* Maes y Grug
* Marford Quarry
* Moel Hiraddug Quarries
* Mynydd Hiraethog
* Mynydd Marian
* Nant-y-Belan and Prynela Woods
* Old Pulford Brook Meadows
* Pandy Quarries
* Parc Bodlondeb and Gwenallt-parc, Lixwm
* Parc Linden, Lixwm
* Penarth Quarry
* Pen-y-Cefn Pasture
* Pistyll Rhaeadr
* Plas Iolyn Bog
* Prestatyn Hillside
* Ruabon/Llantysilio Mountains and Minera
* Shell Brook Pastures
* Shotton Lagoons and Reedbeds
* Sontley Marsh
* Stryt Las a'r Hafod
* Teilia Quarry
* Traeth Pensarn
* Tyddyn-y-barcut
* Ty'n y Ffordd Quarry
* Vicarage Moss
* Y Glyn-diffwys