List of Sites of Special Scientific Interest in Montgomery

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

* Allt y Main Mine
* Breidden Hill
* Bron-y-Buckley Wood
* Bryngwyn Hall Stables and Coach House
* Caeau Clochfaen-Isaf (Clochfaen-isaf Fields)
* Caeau Cwm-Ffrwd
* Caeau Glyn (Glyn Fields)
* Ceunant Twymyn
* Coed Afon Crewi
* Coed Byrwydd
* Coed Copi'r Graig
* Coed Craig-iar
* Coed Hafod-fraith
* Coed Maes-mawr, Coed Esgairneiriau a Cheunant Caecenau
* Coed Mawr
* Coed Pentre (Pentre Wood)
* Coed Ty-mawr
* Coed y Lawnt a Coed Oli
* Coed yr Allt
* Coedydd Llawr-y-glyn
* Coedydd y Beili, Malgwyn a Cribin
* Corndon Hill
* Cors Cefn Llwyd
* Cors Farchwel
* Cors Lawnt
* Cors Llanllugan (Llanllugan Mire)
* Cors Llyn Coethlyn
* Cors Ty-gwyn
* Corsydd Llanbrynmair (Llanbrynmair Moors)
* Dylife Mine
* Ffridd Mathrafal Track Section
* Glebe Field, Llanwddyn
* Granllyn
* Great Wood, Gregynog
* Gungrog Flash
* Gwaith Brics Buttington/Buttington Brickworks
* Gwaun Bryn (Bryn Pasture)
* Gwaun Bwlch Hafod-y-gog
* Gwaun Cilgwyn
* Gwaun Efail Wig
* Gwaun Efail-Llwydiarth
* Gwaun Hafod-wen
* Gwaun Llan (Llan Pastures)
* Gwaun Llwyn-gwyn
* Gwaun Wern-y-wig
* Gwern-y-brain Dingle
* Gweunydd Ceunant
* Gweunydd Dolwen
* Gweunydd Dyfnant
* Gweunydd Ger Fronhaul
* Gweunydd Llechwedd-newydd
* Gweunydd Penstrowed
* Gweunydd Pen-y-Coed
* Gweunydd Ty-Brith (Ty-Brith Meadows)
* Hillington Pastures
* Hollybush Pastures
* Kingswood Meadow
* Llanymynech and Llynclys Hills
* Llyn Mawr
* Lower Garth Meadows
* Mawnog Gwaunynog
* Mochdre Dingles
* Moel y Golfa
* Montgomery Canal
* Pen-Dugwm Woods
* Penstrowed Quarry
* Penygarnedd Mine
* Pumlumon (Plynlimon)
* Rhagnentydd Gwy Uchaf / Upper Wye Tributaries
* Rhosydd Nant-yr-henfron
* Roundton Hill
* Spy Wood and Aldress Dingle
* Trewern Brook
* Waun Cwm Calch
* West Llangynog Slate Mine
* White Grit Meadows