Juan Martínez Téllez de los Ríos (Colmenar Viejo, Crown of Castile, c. 1590s – Guatemala City, February 9, 1657) was a captain in the Royal Armies who participated in the defense of Callao, Viceroyalty of Peru, in 1624.

[4] In May 1624, as captain of his own ship, he participated in the defense of Callao, Peru, during an attack by Dutch pirates led by Jacques L'Hermite.

The viceroy of Peru, Diego Fernández de Córdoba, also tasked him with warning the port of El Realejo in Nicaragua of potential dangers.

[1] From 1631 to 1637, Martínez held various roles in Guatemala City, including chief public scribe, council member, and tax collector.

On February 15, 1640, he presented a list of achievements before the Council of the Indies, requesting the king to grant him a position on the American continent.