García López de Cárdenas, (fl. 16th century), is credited with the first European discovery of the Grand Canyon.
Cárdenas was born in Llerena, Spain, son to Alonso de Cárdenas y doña Elvira de Figueroa and Maria García Osorio. He was the comendador of Caravaca.
López de Cárdenas was conquistador attached to the exploits of Francisco Vasquez de Coronado. Expeditions, including one led by Pedro de Tobar, had heard reports of a large river north of Cíbola (Zuñi). Cárdenas was dispatched in 1540 by the general stationed in Cíbola with the express mission of locating such a river and returning within 80 days. Pedro de Sotomayor accompanied him to record the event as a cronista. After some twenty days of marching in a northerly direction, he was successful; but his band found difficulties in reaching the river (called the River Tizon), owing to the sheer vertical distance down from their position. They were standing on the South Rim of the Grand Canyon. After several days of failed attempts to descend to the water (his men were suffering from thirst), his party was forced to return to Cíbola.
While Cárdenas is credited with being the first European to lay eyes on the Grand Canyon, Hernando de Alarcón had explored the Colorado River several months beforehand.