Máire Mhac an tSaoi (born 4 April 1922) is an Irish language scholar, poet, writer and academic of modern literature in Irish.
Along with Seán Ó Ríordáin and Máirtín Ó Direáin she is, in the words of Louis de Paor, "one of a trinity of poets who revolutionised Irish language poetry in the 1940s and 50s."