Eleanor of Portugal (1328[1] – 30 October 1348), was a Portuguese infanta by birth and Queen of Aragon from 1347 to 1348 as the second wife of King Peter IV.

She is first mentioned when she was 18 years old when two kings vied for her hand in order to secure the support of Portugal: Alfonso XI of Castile who wanted her for his nephew Ferdinand of Aragon, and Peter IV of Aragon whom she finally married on 14 or 15 November 1347[3] in Barcelona, in the same year as the death of the king's first wife, Maria of Navarre.

[4] She died on 30 October 1348, a year after her wedding, succumbing to the Black Death in Teruel while traveling to Jérica.

[5][4] Even though some authors assert that she had a daughter named Beatrice who died as an infant and was raised by her maternal grandmother,[6] including Jerónimo de Zurita and Rui de Pina, there was no issue from the marriage of the Portuguese infanta and the king of Aragon.

She does not mention this child in her will who was mentioned in the two wills of her grandmother Queen Beatrice in 1357 and 1358 in which the queen asked that the remains of the infant Beatrice, probably an illegitimate child of King Peter I of Portugal, originally buried at the Convent of Saint Francis in Santarém, were to be placed at her tomb.