Afon Alun

{{Short description|River in the Vale of Glamorgan, Wales}}

{{about|river in the Vale of Glamorgan, South Wales|the North Wales river of the same name in Welsh|River Alyn}}

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

{{EngvarB|date=August 2019}}

{{Infobox river

| name = Afon Alun

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| image = The_Afon_Alun,_Castle-upon-Alun_-_geograph.org.uk_-_1203616.jpg

| image_size = 250

| image_caption = The river near Castle-upon-Alun

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| subdivision_type1 = Country

| subdivision_name1 = United Kingdom, Wales

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| subdivision_type3 = Region

| subdivision_name3 = South Wales

| subdivision_type4 = County

| subdivision_name4 = Vale of Glamorgan

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|length_km=7.2

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| discharge2_location= Ewenny River

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| source1 =

| source1_location = Llandow, Vale of Glamorgan, Wales

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| mouth = Ewenny River

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Afon Alun is a river in the Vale of Glamorgan, south Wales. It is a tributary of the Ewenny River, which it joins to the south of Bridgend.{{cite web |title=(Ordnance Survey) |url=https://www.bing.com/maps |website=Bing (search engine) |access-date=6 November 2019}}