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Infanta Maria
Born21 November 1264
Coimbra, Kingdom of Portugal
Died6 June 1304(1304-06-06) (aged 39)
Coimbra, Kingdom of Portugal
HousePortuguese House of Burgundy
FatherAfonso III
MotherBeatrice of Castile
ReligionRoman Catholicism

Infanta Maria of Portugal (Coimbra, 21 November 1264 – Coimbra, 6 June 1304; Portuguese pronunciation: [mɐˈɾiɐ]) was a Portuguese infanta (princess) daughter of King Afonso III of Portugal and his second wife Beatrice of Castile.

Maria was born on 21 November 1264 in Coimbra and was for the majority of her life a nun in the Convent of the Lady Canons of Saint John (Convento das Donas Cónegas de São João), near the Monastery of Santa Cruz of Coimbra. She died in the same city on 6 June 1304.