:Cynfyn

{{hatnote|This article is about the 7th-century king of Ergyng. For the 11th-century Cynfyn ap Gwerstan, see Bleddyn ap Cynfyn, see his page. For Cynfyn ap Cillyn, see Rhirid Flaidd.}}

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{{Infobox royalty

| name =Cynfyn
Conbinus

| title =King of Ergyng

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| reign =c. 585 – c. 615

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| predecessor =Peibio Clafrog

| successor =Gwrfoddw

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| issue =Gwrgan Fawr

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| father =Peibio Clafrog

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King Cynfyn ({{langx|la|Conbinus}}; died c. 615) was the King of Ergyng, a kingdom of south-east Wales in the early medieval period. He was the son of Peibio Clafrog.