John Robert Meyer (March 23, 1932 – March 6, 1967) was an American professional baseball player, a right-handed pitcher who appeared in all or parts of seven Major League seasons (1955–61) with the Philadelphia Phillies. Born in Philadelphia, he came from a '"well-to-do New Jersey family," was educated at the exclusive William Penn Charter School, and attended the University of Delaware and Wake Forest University. He was listed at 6 feet 1 inch (1.85 m) tall and weighing 175 pounds (79 kg).

Meyer signed with the Phillies in 1951 and steadily rose through their farm system, winning 15 games for the 1954 Syracuse Chiefs of the Triple-A International League. His most successful Major League season was his 1955 rookie campaign, when he led the National League in games finished (36) and saves (16) and fanned 97 batters in 110 ¹⁄₃ innings pitched. He also made five starts, and finished second (to Bill Virdon) in NL Rookie-of-the-Year balloting. His effectiveness then began to fade, however, and he spent part of 1957 back in Triple-A.

Meyer rebounded to post respectable seasons in both 1958 and 1959, largely in middle relief, but his career was negatively affected by his growing reputation as a drinker and late-night carouser. He was a member—with fellow pitchers Turk Farrell and Jim Owens—of the so-called "Dalton Gang", who received notoriety around baseball for multiple, and well-publicized, off-field incidents.

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