Many organisations, institutions, groups and individuals have declared their support for the campaign. Some of these are listed below but more are joining all the time.
Councils
- Aberystwyth Town Council
- Carmarthen Town Council
- Carmarthenshire County Council
- Ceredigion County Council
- Lampeter Town Council;
- Llanbadarn Fawr Community Council
- Llandovery Town Council
- Llangyfelyn Community Council
- Llanon Community Council
- Llanpumsaint Community Council
- Newcastle Emlyn Town Council
- Newchurch and Merthyr Community Council
- Ystrad Fflur Community Council
- Llandysul Community Council
Politicians
- Mick Antoniw MS (Labour, Pontypridd)
- Rhun ap Iorwerth MS (Plaid Cymru, Ynys Mon)
- Angela Burns MS (Conservative, Carmarthen West and Pembs South)
- Jeremy Corbyn MP (Labour, Islington)
- Byron Davies MS (Conservative, South West Wales)
- Jonathan Edwards MP (Plaid Cymru, Carmarthen East and Dinefwr)
- Rebecca Evans MS (Labour, Mid and West Wales)
- Rhodri Thomas MS (Plaid Cymru, Carmarthen East and Dinefwr
- William Graham MS (Conservative, South Wales East)
- Janice Gregory MS (Labour, Ogmore)
- Neil Hamilton MS (Brexit, Mid and West Wales)
- Mike Hedges MS (Labour, Swansea East)
- Mark Isherwood MS (Conservative, North Wales)
- Bethan Jenkins MS (Plaid Cymru, South Wales West)
- Carwyn Jones MS (Labour, Bridgend)
- Elin Jones MS (Plaid Cymru, Ceredigion)
- Ben Lake MP (Plaid Cymru, Ceredigion)
- Karl McCartney MP (Conservative, Lincoln)
- William Powell MS (Liberal Democrat. Mid and West Wales)
- Adam Price MS (Plaid Cymru, Carmarthen East and Dinefwr)
- Nick Ramsey MS (Conservative, Monmouth)
- Jenny Rathbone MS (Labour, Cardiff Central)
- Liz Saville-Roberts MP (Plaid Cymru, Dwyfor and Meirionnydd)
- Rhodri Thomas MS (Plaid Cymru, Carmarthen East and Dinefwr: retired)
- Joyce Watson MS (Labour, Mid and West wales)
- Lindsay Whittle MS (Plaid Cymru, South Wales East)
- Mark Williams (Welsh Liberal Democrats, Ceredigion)
- Sian Gwenllian (Plaid Cymru)
- Tonia Antoniazzi (Labour)
- Natasha Asghar (Conservatives)
Other institutions, groups, parties and individual people
- Aberystwyth University
- Bangor University
- Borders Railway
- Cymdeithas yr Iaith Gymraeg (the Welsh Language Society)
- Friends of the Earth Cymru
- Glyndŵr University
- Green Party for Wales
- Hywel Dda Health Board
- Network Rail
- Plaid Cymru
- Railfutures
- University of Wales Trinity Saint David
- University of Wales Lampeter Society
- Welsh Liberal Democrats
- Welsh Labour Party
- Rhwydwaith Gwydn Resilience Network (www.grwp.wales)
- Singing The Line Into Existence
- Huw Edwards
- Derek Brockway
- Iolo Williams
- Gillian Elisa