Ortiz Island is an island in the Duroch Islands. It lies 0.4 kilometres (0.2 nmi) south of the eastern end of Largo Island and a like distance from the northern coast of Trinity Peninsula. The name was given by Martin Halpern, leader of the University of Wisconsin (USARP) field party which geologically mapped the Duroch Islands, 1961–62. It honors Marcos Ortiz G., Captain of the Chilean ship its study of this area.
