| John | |
| Hereditary Prince of Portugal | |
| Father: | Afonso V of Portugal |
| Mother: | Isabella of Coimbra |
| Birth Date: | 29 January 1451 |
| Birth Place: | Sintra National Palace, Sintra, Kingdom of Portugal |
| Death Date: | February 1451 |
| Burial Place: | Monastery of Batalha, Batalha, District of Leiria, Portugal |
| House: | Aviz |
John, Prince of Portugal (Portuguese: João; 29 January[1] – February 1451) was a Portuguese infante, son of Afonso V and Isabella of Coimbra.[2] He was born heir to the throne in 1451, but he died young during the same year. The title of Prince of Portugal then passed again to Infante Ferdinand, Duke of Viseu, his uncle.