In Division 2, Llandyrnog United were champions with Llanfairpwll as runners-up.
Holyhead Hotspur were champions in the previous season and were promoted to the Cymru Alliance.
They were replaced by Llangefni Town who were relegated from the Cymru Alliance.
Glantraeth were champions in the previous season and were promoted to Division 1 along with runners-up, Llanberis.
They were replaced by Gwynedd League champions, Penrhyndeudraeth and Vale of Clwyd and Conwy Football League runners-up, Meliden who were promoted to Division 2.