Calvin Coolidge Ermer (November 10, 1923 – August 8, 2009) was an American second baseman, manager, coach and scout in Major League Baseball. He was born in Baltimore, Maryland, the youngest of seven children, attended Patterson High School, and served in the United States Marine Corps during World War II. As a player, Ermer threw and batted right-handed, stood 6 feet (1.8 m) tall and weighed 175 pounds (79 kg).