The River Aeron is a small river in Ceredigion, Wales, that flows into Cardigan Bay at Aberaeron. It is also referred to on some older maps as the River Ayron.

Ceredigion ( ), historically Cardiganshire, is a county in the west of Wales. It borders Gwynedd across the Dyfi estuary to the north, Powys to the east, Carmarthenshire and Pembrokeshire to the south, and the Irish Sea to the west. Aberystwyth is the largest settlement and, together with Aberaeron, is an administrative centre of Ceredigion County Council.