Gabriel Antonio Martínez Díaz (March 18, 1940 – August 24, 1991) was a Cuban-born Major League Baseball shortstop who played in parts of four seasons for the Cleveland Indians (1963–66), appearing in 73 career games. The native of Perico threw and batted right-handed, stood 5 feet 10 inches (1.78 m) and weighed 165 pounds (75 kg). Martínez' 30 big-league hits included five doubles. He drove in ten runs.