Robert Perry Lillis (born June 2, 1930) is an American former infielder, manager, coach and scout in Major League Baseball (MLB). Lillis was an original member of the 1962 expansion Houston Colt .45s who remained with the club (renamed the Astros in 1965) for more than two decades and later became its manager. He threw and batted right-handed and was listed as 5 feet 11 inches (1.80 m) tall and 160 pounds (73 kg).