Rudolph Kemmler, born Rudolph Kemler, (January 1860 – June 20, 1909) was an American Major League Baseball catcher for all or part of eight seasons. He played for seven different teams in the National League and American Association between 1879 and 1889. Kemmler was a poor hitter but a good defensive catcher. In the days before catchers had protection against pitched balls, he was quite durable. He spent most of his career as a reserve player. Kemmler caught two no-hitters in 1884 for Columbus Buckeye pitchers Ed Morris and Frank Mountain. Kemmler died in his hometown of Chicago, and is interred at Concordia Cemetery in Forest Park, Illinois.

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