| Isabel | |
|---|---|
| Lady of Reguengos de Monsaraz, Colares and Belas | |
_-_Genealogia_de_D._Manuel_Pereira,_3.%C2%BA_conde_da_Feira_(1534).png) Isabel in a 1534 miniature in the Genealogy of D. Manuel Pereira, 3rd Count of Feira | |
| Born | October 1402 Barcelos |
| Died | 26 October 1466 (aged 63–64) Arévalo |
| Burial | |
| Spouse | John, Constable of Portugal |
| House | Braganza |
| Father | Afonso I, Duke of Braganza |
| Mother | Beatriz Pereira de Alvim |
Isabel of Barcelos (October 1402 – 26 October 1466), also known as Isabel of Braganza, was a lady of the Portuguese nobility during the Late Middle Ages. She was the daughter of Afonso I, Duke of Braganza and Beatriz Pereira de Alvim, and she married Infante John, Lord of Reguengos de Monsaraz, her half-uncle, son of John I of Portugal.