| Isabella of Navarre | |
| Countess of Armagnac | |
| Spouse: | John IV of Armagnac |
| Issue: | Marie, Duchess of Alençon John V of Armagnac Eleanor, Princess d'Orange, Lady of Arlay and Arguel Charles, Viscount of Fézensaguet Isabella, Lady of the Four-Valleys |
| House: | Évreux |
| Father: | Charles III of Navarre |
| Mother: | Eleanor of Castile |
| Birth Date: | 1395 |
| Birth Place: | Kingdom of Navarre |
| Death Date: | 31 August 1450 |
Isabella of Navarre (1395 – 31 August 1450) was the younger surviving daughter of Charles III of Navarre and his wife Eleanor of Castile. She was a member of the House of Évreux.
Shortly before Isabella's birth, her mother was dealing with problems in Castile, involving her brother John I of Aragon. Eleanor was forced to return to Navarre for her daughter's birth.
Isabella was the sixth of eight children. Her two younger brothers died in childhood, leaving Isabella and her five older sisters. Her sisters included: Joanna (died before inheriting the throne), Blanche (successor of their father), and Beatrice.
Isabella was firstly betrothed to Infante John of Aragon around 1414. Her mother, Queen Eleanor bequeathed her money for the marriage.[1] John later became King of Aragon but broke off his contract with Isabella, in hopes of marrying Joanna II of Naples.
Isabella eventually married on 10 May 1419 John IV of Armagnac. This marriage was John's second marriage, after the death of his first wife Blanche of Brittany, who had left no sons.
Isabella and John had five children:
Isabella and her husband both died in 1450; she died in August and he died three months later in November, she was around fifty-four at the time of death.