Gregory Emmett Sims (born June 28, 1946) is an American former professional baseball player. During his nine-season (1965–1973) playing career, he spent part of one season, 1966, as a member of the Houston Astros of Major League Baseball. An outfielder, he was a switch-hitter who threw right-handed, stood 6 feet (1.8 m) tall and weighed 190 pounds (86 kg).