The Cymru Premier has two feeder leagues, known as the Cymru South and Cymru North since the start of the 2019-20 season when the Football Association of Wales took over control of the second tier of Welsh football following a review of the Welsh league pyramid.

The champions of each of these leagues can be promoted to the Cymru Premier, subject to acceptable ground facilities, and if the champions cannot meet the criteria the runner-up team may be considered.

The Cymru South incorporated most the clubs of the old First Division of the Welsh Football League, while the Cymru North replaced the Cymru Alliance.

The Cymru South is now fed by the Welsh Football League, which has two divisions. Promotion to, and relegation from the Welsh League is structured on three regional football associations (Gwent FA, South Wales FA, and West Wales FA). Each can send one promoted team into the Welsh Football League. This is straightforward enough in the Gwent FA area, where there is one senior league, the Gwent County League, whose champions (or runners-up) are eligible, if they satisfy Welsh Football League criteria.

The South Wales FA area was formerly more complicated however, as this region had two senior leagues of identical status covering the same area, each with two divisions, the South Wales Senior League and the South Wales Amateur League, but as of the 2015-16 season the two divisions merged to become the South Wales Alliance League, with the champions promoted to the Welsh Football League subject to meeting criteria.

The West Wales FA area is the only one not to have a senior league in its area – this means that there are four local leagues (Pembrokeshire League, Carmarthenshire League, Swansea Senior Football League and the Neath & District League) with all their champions potentially having to play-off for the one available promotion place.

The Cymru North has three regional leagues feeding it… the Mid Wales League (covering Powys and Ceredigion), the Welsh Alliance League (covering all of the north except Wrexham), and the Welsh National League (Wrexham Area, covering the region around Wrexham). Again, the champions or runners-up of these leagues can be promoted, given suitable grounds.