Pembroke Monkton and St Mary South is the name of an electoral ward in the town of Pembroke, Pembrokeshire, Wales. The ward elects two county councillors to Pembrokeshire County Council. The seats will be contested for the first time in the 2022 Pembrokeshire County Council election. The ward replaced the Pembroke Monkton and Pembroke St Mary South electoral wards, which each elected one county councillor. The ward was created following a boundary review which took place in 2019.