Ramiro Garcés (died 6 January 1083) was the second son of king García Sánchez III of Navarre and queen Stephania. He was a powerful nobleman in the region around Nájera and Calahorra and a major figure at the courts of both Navarre and Castile. He was ambushed and killed while trying to take possession of a castle during the Reconquista.
Ramiro is first mentioned in a charter of his father's dated 18 April, probably 1052, as an infans. Still an infans, he confirmed a charter on 11 March 1055, during the reign of his brother, Sancho IV. On 19 March 1058, still just infans, he confirmed a grant of Gomesano, Bishop of Calahorra. On 20 July 1062 Ranimirus infans, Garsea rex prolis (infante Ramiro, child of king García) donated property to the prior of San Martín de Albelda, which was confirmed by the then lord of Calahorra, Fortún Garcés. The will of queen Stephania, dated 1066, bequeathed some property to Ramiro, who is referred to as in Sancto Stephano in a charter of Sancho IV's of 17 April 1072. He appears as domnus Ranimirus, dominator Sanacti Stefani (lord Ramiro, lord of Saint Stephen) on 6 August that year. He can be seen subsequently involved in the politics of the neighbouring Kingdom of Aragon, when he witnessed a charter of Garsias [...] Aragonensium episcopus (García [...] bishop of the Aragonese) introducing the Augustinian rule into the cathedral of (1076/9), using only the formula regis filius (son of the king).
In 1076 Sancho IV was assassinated, leaving infant heirs, and the kingdom's neighbors pounced on the opportunity. The western provinces were annexed by Alfonso VI of Castile while in Pamplona, the capital, Sancho Ramírez of Aragon was elected king by the nobles. Bernard Reilly believed that Ramiro became a ward of Alfonso VI at Nájera in June and July 1076, but as Ramiro must have been an adult this seems unlikely. He was certainly at the Castilian court by 3 September 1079, however, when he and his sister Ermesinda signed confirmed a charter of Aldefonsus (Alfonso) imperator totius Hispanie. Ermesinda married Fortún Sánchez, lord of Yarnoz, while Ramiro's other sister, Urraca, married García Ordóñez, a powerful Castilian magnate.