Mae Gorchymyn Awdurdodau'r Parciau Cenedlaethol (Cymru) 1995 yn nodi bod cyfrifoldeb dros benodi bwrdd Awdurdodau'r Parciau Cenedlaethol yn cael ei rannu rhwng yr Awdurdodau Lleol cyfansoddol a Gweinidogion Cymru. Mae Atodlen 2 o'r Gorchymyn yn nodi:
The National Park Authorities (Wales) Order 1995 states responsibility for appointing the board of the National Park Authorities is shared between the constituent Local Authorities and the Welsh Ministers. Schedule 2 of the Order states that:The Board of the Brecon Beacons National Park Authority must be 24 members in total, with the number of Members appointed by Local Authorities being 16 and the number appointed by Welsh Ministers being 8.The Board of the Pembrokeshire Coast National Park Authority must be 18 Members in total with the number of Members appointed by Local Authorities being 12 and the number appointed by Welsh Ministers being 6.The Board of the Snowdonia National Park Authority must be 18 Members in total with the number of Members appointed by Local Authorities being 12 and the number appointed by Welsh Ministers being 6.