This study presents a motif classification, quantification, and regional comparisons for engraved rock art from the Maderas Volcano on Ometepe Island, Nicaragua. Maderas has the largest concentration of petroglyphs thus far reported in Central America. A formal analysis was conducted, which included construction of a typology for, then quantitative analysis of motifs found on over 700 bouldersonly a portion of that known to exist on the island.