| CWLB | CWLP | Cwlth |
| CWLU | Cwm | CWM |
| Cwm (data processor for the semantic web) | CWM (disambiguation) | Cwm (disambiguation) |
| Cwm (landform) | Cwm (software) | Cwm (window manager) |
| Cwm Albion F.C. | Cwm Bach, Sychpant | Cwm Bargoed |
| Cwm Bargoed railway station | Cwm Bwchel Farmhouse, Llanthony | Cwm Cadlan |
| Cwm Cadnant | Cwm Caner Mawr | Cwm Caseg |
| Cwm cau | Cwm Cayo Brook Fault | Cwm Clydach |
| Cwm Clydach (disambiguation) | Cwm Clydach (electoral ward) | Cwm Clydach National Nature Reserve |
| Cwm Clydach RSPB Reserve | Cwm Clydach SSSI | Cwm Clydach, Cydweli |
| Cwm Clydach, Kidwelly | Cwm Clydach, Rhondda Cynon Taf | Cwm Cowlyd |
| Cwm Craig-ddu Quarry | Cwm Crymlyn Road Section | Cwm Cydfin, Leckwith |
| Cwm Cyffog | Cwm Cynnen Fault | Cwm Dewi |
| Cwm Dockin Fault | Cwm Doethie - Mynydd Mallaen | Cwm Doethie – Mynydd Mallaen |
| Cwm Du Woodlands | Cwm Dwfnant Fault | Cwm Dyli |
| Cwm Earl Fault | Cwm Ebol quarry | Cwm Ebol quarry tramway |
| Cwm Ebol Tramway | Cwm Eigiau quarry | Cwm Fathew |
| Cwm Felin Boeth Formation | Cwm Felin Fault | Cwm fjordbank glyphs vext quiz |
| CWM FX | Cwm Glo | Cwm Gwaun |
| Cwm Gwyn | Cwm Head | Cwm Hengae |
| Cwm Hiraeth | Cwm Hyfryd | Cwm Hyfryd/Bro Hydref |
| Cwm Iau | Cwm Idwal | Cwm idwal |
| Cwm Iou | CWM LCR Honda | Cwm Level Park |
| Cwm Llwyd Fault | Cwm Llyfnant | Cwm Machno |
| Cwm Mathew | Cwm Nantcol | Cwm Oergwm Nature Reserve |
| Cwm Ogwr | Cwm Penmachno | Cwm Pennant Fault |
| Cwm Pit Fault | Cwm Prysor Halt railway station | Cwm Prysor railway station |
| Cwm Prysor Viaduct | Cwm railway station | Cwm Rheidol Railway |
| Cwm Rhondda | Cwm Risca Meadow | Cwm Silicon |
| Cwm Sylwi Fault | Cwm Taf Fechan Woodlands | Cwm Taf Health Board |
| Cwm Taf Morgannwg Health Board | Cwm Taf Morgannwg University Health Board | Cwm Taf NHS Trust |
| Cwm Taf University Health Board | Cwm Talwg | Cwm Teigl Halt railway station |
| Cwm Twrch | Cwm Twrch Site of Special Scientific Interest | Cwm Twrch SSSI |
| Cwm Twrch transmitting station | Cwm Wanderers A.F.C. | Cwm Welfare A.F.C. |
| Cwm Welfare F.C. | Cwm y Glo | Cwm yr Abbey Stream Section |
| Cwm yr eglwys | Cwm yr Eglwys | Cwm Ystwyth |
| Cwm Ystwyth Lead Mine | Cwm, Blaenau Gwent | Cwm, Denbighshire |
| Cwm, Ebbw Vale | Cwm, Llanrothal | Cwm-dows Fault |
| Cwm-erfin | Cwm-felin-Fach | Cwm-Hwnt |
| Cwm-Mawr Fault | Cwm-Pandy quarry | Cwm-Pandy Quarry |
| Cwm-pandy quarry | Cwm-pandy Quarry | Cwm-Pandy Slate Quarry |
| Cwm-Pandy slate quarry | Cwm-pandy slate quarry | Cwm-pandy Slate Quarry |
| Cwm-twrch Uchaf | Cwm-y-glo | Cwm-y-Glo |
| Cwm-y-Glo railway station | Cwm-yr-Eglwys | Cwmafan |
| Cwmafon | Cwmaman | Cwmaman Colliery Halt railway station |
| Cwmaman Crossing Halt railway station | Cwmaman Institute F.C. | Cwmamman |
| Cwmamman United A.F.C. | Cwmamman Urban District | Cwmann |
| CWMARS | Cwmavon | Cwmavon (disambiguation) |
| Cwmavon Glam railway station | Cwmavon RFC | Cwmavon, Monmouthshire |
| Cwmavon, Neath Port Talbot | Cwmavon, Torfaen | Cwmbach |
| Cwmbach railway station | Cwmbach station | Cwmbach, Carmarthenshire |
| Cwmbran | Cwmbran (GWR) railway station | Cwmbran Brewery |
| Cwmbran bus station | Cwmbran Celtic F C | Cwmbran Celtic F. C. |
| Cwmbran Celtic F.C. | Cwmbran Celtic FC | Cwmbran Central |
| Cwmbran Centre | Cwmbran High School | Cwmbran New Town |
| Cwmbran railway station | Cwmbran railway station (Great Western Railway) | Cwmbran RFC |
| Cwmbran Shopping Centre | Cwmbran Stadium | Cwmbran station |
| Cwmbran Town | Cwmbran Town A F C | Cwmbran Town A. F. C. |
| Cwmbran Town A.F.C. | Cwmbran Town AFC | Cwmbran Town F.C. |
| Cwmbran Town FC | Cwmbran, Wales | Cwmbrân |
| Cwmbrân Town A.F.C. | Cwmbrwyno | Cwmbwrla |
| Cwmbwrla (electoral ward) | Cwmcarn | Cwmcarn Forest Drive |
| Cwmcarn High School | Cwmcarn railway station | Cwmcarnhywel |
| Cwmcarvan | Cwmcarvan Fault | Cwmcidi |
| Cwmcoednerth | Cwmcych | Cwmdar |
| Cwmdare | Cwmdauddwr | Cwmdâr |
| Cwmderi | Cwmdonkin Park | Cwmdu |
| Cwmdu (disambiguation) | Cwmdu railway station | Cwmdu, Powys |
| Cwmdu, Swansea | Cwmduad | Cwmerfyn |
| Cwmfelin | Cwmfelin Mynach | Cwmfelin mynach |
| Cwmfelin Primary | Cwmfelin Primary School | Cwmfelinfach |
| Cwmffrwd | Cwmffrwd Halt railway station | Cwmffrwdoer Halt railway station |
| Cwmgelli Cemetery | Cwmgelly Cemetery | Cwmgiedd |
| Cwmgors | Cwmgors RFC | Cwmgors transmitting station |
| Cwmgorse | Cwmgwili | Cwmgwili, Bronwydd |
| Cwmgwineu Fault | Cwmgwrach | Cwmgwrach RFC |
| Cwmhir Abbey | Cwmhiraeth | Cwmifor |
| Cwmllecoediog | Cwmllynfell | Cwmllynfell Fault |
| Cwmllynfell railway station | Cwmllynfell RFC | Cwmmawr railway station |
| Cwmmawr Thrust | CWMN | Cwmneol Fault |
| Cwmneol Halt railway station | Cwmni Ballet Gwent | Cwmni Theatr Cymru |
| Cwmni Theatr Ieuenctid Maldwyn | Cwmodyn quarry | Cwmodyn Slate & Slab Quarry Company |
| Cwmorthin quarry | Cwmorthin Quarry | Cwmorthin Tramway |
| CWMP | Cwmp | Cwmpandy Quarry |
| Cwmpandy quarry | Cwmpandy slate quarry | Cwmpandy Slate Quarry |
| Cwmparc | Cwmpengraig | Cwmpennar |
| Cwmrhyd-y-Gau Halt railway station | Cwmrhydyceirw | Cwmry |
| CWMS | Cwmsychbant | Cwmsyfiog Halt railway station |
| Cwmsyfiog railway station | Cwmsymlog | Cwmtawe |
| Cwmtawe Community School | Cwmtawe Comprehensive School | Cwmtillery |
| Cwmtwrch | Cwmtwrch RFC | Cwmwd |
| Cwmwd Deuddwr | Cwmwd Dindaethwy | Cwmwd Ial |
| Cwmwd Iâl | Cwmwd Llanfaes | Cwmwd Penrhos |
| Cwmwt Ial | Cwmwt Iâl | Cwmwt Llan-faes |
| Cwmwt Llanfaes | Cwmwt Llanmaes | Cwmwt Llanuaes |
| Cwmwt Llanvaes | Cwmwysg | Cwmynyscoy |
| Cwmyoy | Cwmyoy Church | Cwmystwyth |
| Cwmystwyth Grits Group | Cwmystwyth Mines | CWN |
| CWN (disambiguation) | CWN (TV station) | Cwn annwfn |
| Cwn Annwn | Cwn Mamau | CWN-6 |
