Harry Glenville "Doc" Tonkin (August 11, 1881 – May 30, 1959) was an American physician and professional baseball player, who appeared in one major-league game, for the 1907 Washington Senators.

Tonkin was born in 1881 in Concord, New Hampshire.^[1] He played baseball professionally from 1905 to 1907, for three different teams in Minor League Baseball, for which statistical detail is lacking.^[2] He played in one major-league game, for the Washington Senators on May 30, 1907.^[1] He pitched 2+2⁄3 innings, and gave up six hits and two earned runs.^[1] He also collected two hits in two at bats,^[1] for a rare 1.000 batting average.^[3]

Tonkin attended Baltimore Medical College, which was later absorbed into the University of Maryland.^[4] He operated a medical practice in Martinsburg, West Virginia, where he served three terms as mayor.^[4] During World War I, he served briefly as a captain in the United States Army Medical Corps.^[4] Tonkin died in 1959 in Miami, Florida.^[1][4]

• Career statistics from Baseball Reference, or Baseball Reference (Minors), or Retrosheet

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