Paul-Marie Cao Ðinh Thuyên (7 January 1927 – 29 August 2022) was a Roman Catholic prelate from Vietnam.

Cao Ðihn Thuyên was born in Vietnam and was ordained to the priesthood in 1960.

He served as coadjutor bishop and diocese bishop of the Roman Catholic Diocese of Vinh from 1992 until his retirement in 2010.

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