Jesse Joseph Haines (July 22, 1893 – August 5, 1978), nicknamed "Pop", was a right-handed pitcher in for the Cincinnati Reds and St. Louis Cardinals of Major League Baseball (MLB). After a lengthy stint in minor league baseball, he played briefly in 1918, then from 1920 to 1937. He spent nearly his entire major league career with the Cardinals. Haines pitched on three World Series championship teams. Though he had a kind personality off the field, Haines was known as a fiery competitor during games.