:Pembroke St Mary South

{{Use dmy dates|date=October 2019}}

{{Infobox UK place

| official_name = Pembroke St Mary South

| country = Wales

| type = Electoral ward

| static_image_name = Electoral wards in and surrounding the towns of Pembroke and Pembroke Dock.png

| static_image_caption = Pre-2022 ward locations within the towns of Pembroke and Pembroke Dock

| static_image_width = 255px

| population = 1,434

| population_ref = (2011 census)

| coordinates = {{coord|51.672|-4.918|display=inline,title}}

| post_town = PEMBROKE

| postcode_area = SA

| postcode_district = SA71

| dial_code = +44-1646

| constituency_westminster = Carmarthen West and South Pembrokeshire

| unitary_wales = Pembrokeshire

| constituency_welsh_assembly = Carmarthen West and South Pembrokeshire

| CASCode =

| councillors = 1 (County)
3 (Town Council)

| hide_services = yes

}}

Pembroke St Mary South was the name of an electoral ward in the town of Pembroke, Pembrokeshire, Wales.{{cite web|url=http://www.legislation.gov.uk/uksi/1998/3141/made?view=plain|title=The County of Pembrokeshire (Electoral Arrangements) Order 1998 |publisher=Legislation.gov.uk |accessdate=3 March 2018 }} It covers the area including the town centre and Pembroke Castle and the town immediately to the west of St Daniel's Hill.{{cite web|url=https://www.ordnancesurvey.co.uk/election-maps/gb/ |title=Election Maps |publisher=Ordnance Survey |accessdate=3 March 2018 }}

The ward elected a county councillor to Pembrokeshire County Council and three town councillors to Pembroke Town Council.{{cite web|url=http://www.pembroketownguide.org.uk/councillors.html |title=Councillors |publisher=Pembroke Town Guide |accessdate=3 March 2018 }}

According to the 2011 UK Census the population of the ward was 1,434.{{NOMIS2011|id=1237327775|title=Pembroke: St. Mary South 2011 Census Ward|accessdate=3 March 2018}}

A boundary review took place in 2019, where it was noted that the number of eligible voters was 33% below the average for an electoral ward in Pembrokeshire. As a result it was recommended that part of the neighbouring St Michael ward was transferred to the St Mary South ward, increasing the number of electors by 531. It was also proposed that the ward be combined with the neighbouring Monkton electoral ward, with the resulting ward electing two county councillors.{{cite web |url=https://ldbc.gov.wales/sites/ldbc/files/review/Pembs%20Final%20Report%20V7_reduced.pdf |title=Review of the Electoral Arrangements of the County of Pembrokeshire |publisher=Local Democracy and Boundary Commission for Wales |year=2019 |pages=61-64}} These changes came into effect in 2021, with the creation of a new electoral ward named Pembroke Monkton and St Mary South.{{Cite legislation Wales | type = wsi | year = 2021 | number = 1182 | title = The County of Pembrokeshire (Electoral Arrangements) Order 2021}}