Rodrigo Martínez (Latin: Rudericus Martini) (died July 1138) was a Leonese nobleman, landowner, courtier, military leader, governor, and diplomat, "the most powerful lay figure in the region of the western Tierra de Campos," who "emerges as far and away the most regular visitor to the court of Alfonso VII between 1127 and 1138." He was a member of the Flagínez family, rose to the highest rank in the kingdom and met his end on the battlefield.
He was the eldest son of Martín Flaínez and Sancha Fernández. Throughout his career he was closely associated with his brothers Pedro and Osorio Martínez. All three Martínez brothers met their ends on the battlefield. Martín Flaínez is known to have donated a meadow, money, and some candles to the monastery of Santa Eugenia de Cordovilla because the monks had performed a successful exorcism on the young Rodrigo.
The first record of Rodrigo's public career dates to 1 May 1110. In 1117 he was governing the tenencia of Castroverde. Between 1117 and 1136 he held the tenencia of Becilla de Valderaduey. From 1125 to 1137 he held that of Aguilar de Campoo. Queen Urraca died on 8 March 1126. When Alfonso VII finally took control of the "towers of León", the fortress that guarded the imperial capital of León, Rodrigo along with the other Leonese magnates came to do him homage. In 1134 he held that of Mayorga and in 1135 those of Atienza and Medina del Campo concurrently. In 1137 he held Calahorra, and there is a reference to him ruling Calahorra in a charter mistakenly dated to 1140. In 1136–37 he was also governing the Tierra de Campos. At some point he seems to have ruled in Grajal de Campos, since a charter of 1152 refers to both him and Ramiro Fróilaz as having held the title of potentior of Grajal. Between 1126 and 1138 he held the towers of León for the crown. From 1120 to 1126 he held the tenencia of Melgar de Arriba (or possibly Melgar de Fernamental). It is possible that in 1126 he briefly held Somoza, but the only charter referring to this is suspect. From 1123 to 1136 he ruled Villalobos. From 1132 until his death he ruled Zamora.