Claude Alfred Jonnard (November 23, 1897 – August 27, 1959) was a professional baseball player. He was a right-handed pitcher over parts of six seasons (1921–1924, 1926, 1929) with the New York Giants, St. Louis Browns and Chicago Cubs. For his career, he compiled a 14–12 record in 137 appearances, most as a relief pitcher, with a 3.79 earned run average and 160 strikeouts. Jonnard was a member of the Giants National League pennant-winning teams in 1923 and 1924, losing both World Series (to the New York Yankees and Washington Senators, respectively). In World Series play, he made three relief appearances, giving up no runs.

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