Germain Marc'hadour (16 April 1921 – 22 February 2022) was a French Catholic priest and a professor of English at the Université Catholique de l'Ouest in Angers.

He was an internationally recognized authority on the life and work of Saint Sir Thomas More and the founder of the journal Moreana.

Marc'hadour was born in Langonnet, Brittany, the son of shopkeepers, and grew up bilingual in French and Breton.

He contributed the article on Thomas More to the fifteenth edition of the Encyclopædia Britannica On 18 May 1988, he was created a knight of the Ordre des Palmes Académiques.

In 1989 a Festschrift was published in his honour, Miscellanea Moreana: Essays for Germain Marc'hadour, edited by Clare M. Murphy and Henri Gibaud (Medieval and Renaissance texts and studies 61).