| Charles IV | |
|---|---|
 | |
| King of Navarre de jure only | |
| Reign | 1441–1461 |
| Predecessor | Blanche I and John II |
| Successor | Blanche II |
| Contender | John II |
| Born | 29 May 1421 Peñafiel |
| Died | 23 September 1461 (aged 40) Barcelona |
| Spouse | Agnes of Cleves |
| House | Trastámara |
| Father | John II of Aragon |
| Mother | Blanche I of Navarre |
Charles, Prince of Viana (Basque: Karlos IV.a) (29 May 1421 – 23 September 1461), sometimes called Charles IV of Navarre, was the son of King John II of Aragon and Queen Blanche I of Navarre.[1]