James Michael McManus (born July 20, 1936) is a retired American professional baseball player whose ten-season career included five games played in Major League Baseball for the Kansas City Athletics (1960) and two years (1962–1963) in Japanese baseball (NPB). A first baseman, McManus threw and batted left-handed and was listed as 6 feet 4 inches (1.93 m) tall and 215 pounds (98 kg). He was born in Brookline, Massachusetts. During his two campaigns with the Taiyo Whales of NPB, McManus batted .236 with 20 home runs.