| Birth Date: | 15 September 1607 |
| Death Date: | 30 July 1632(aged 24) |
| Burial Place: | El Escorial |
| House: | Habsburg |
| Father: | Philip III of Spain |
| Mother: | Margaret of Austria |
Infante Carlos of Spain (15 September 1607 – 30 July 1632), was the second son of King Philip III of Spain and his queen consort, Margaret of Austria.
Infante Carlos was the younger brother of Philip IV, and, as long as the King remained childless, was heir to the Spanish throne. Carlos was never a friend of Philip's favourite and prime minister, the Count-Duke of Olivares, and though he was uninterested in politics, he was used by various nobles in attempts to overthrow Olivares.
During his brother's severest illness, Carlos was on the point of ascending the throne, but Felipe recovered and in 1629 finally fathered a son, Balthasar Carlos. This dissipated Carlos's political importance completely.
Contemporaries described Infante Carlos as prudent and liberal and he seemed to have been a "vigilant observer of royal customs".[1] Other than his brother Fernando, who was assigned a role at an early age, he remained in a child-like position until his mid-twenties. Although he received official visits and expressed political opinions, he remained without an own household, remaining in the household of the king.[2]
Carlos died in 1632, aged 24. Francisco de Quevedo dedicated a sonnet entitled The Burial of the Most Serene Infante Don Carlos to this event.