| Infante Fernando | |
| Lord of Serpa and Lamego | |
| Spouse: | Sancha Fernández de Lara |
| Issue: | Sancho Fernandes de Serpa |
| House: | Portuguese House of Burgundy |
| Father: | Afonso II of Portugal |
| Mother: | Urraca of Castile |
| Birth Date: | summer of 1217 |
| Birth Place: | Kingdom of Portugal |
| Death Date: | 19 January 1246 (aged 29) |
| Death Place: | Kingdom of Portugal |
Infante Fernando of Portugal (pronounced as /pt/), or Ferdinand in English, was a Portuguese infante (prince), son of King Afonso II of Portugal and his wife Urraca of Castile, daughter of Alfonso VIII of Castile.
Fernando was born in the summer of 1217 and was made Lord of Serpa and Lamego in 1223. It is known that he travelled to Rome in 1237 to beg for a pardon from Pope Gregory IX for his violence against certain clerics. He died on 19 January 1246.
He married Sancha Fernández de Lara, daughter of Fernando Núñez de Lara and wife Mayor González, without any documented issue.
He had, however, a bastard son by an unknown woman named Sancho Fernandes de Serpa, who was a Prior at Santo Esteban de Alfama,but had illegitimate issue, being the ancestor of the de Serpa family.
In a study from the Spanish historian Faustino Menéndez-Pidal de Navascués,[1] the infante Fernando should have used a Coat of Arms representing a Wyvern (Serpe in Portuguese), the symbol of his Lordship of Serpa, in south Alentejo, with a border where, alternately, are represented the arms of Portugal (paternal ancestry) and those of Castile (maternal ancestry).