Henry Homer "Doc" Gessler (December 23, 1880 – December 25, 1924) was a Major League Baseball player born in Greensburg, Pennsylvania, who began his eight-season career, at the age of 22, with the Detroit Tigers in 1903. He played mainly as a right fielder in a career that totaled 880 games played, 2969 at bats, 831 hits, 363 RBIs and 14 home runs. Doc died in Greensburg at the age of 44, and is interred in Saint Bernard Cemetery in Indiana, Pennsylvania.

Before his baseball career, he attended Ohio University, Washington & Jefferson College, and became a physician, graduating from Johns Hopkins Medical School. He was one of three doctors in the 1906 World Series (with Doc White and Frank Owen).

After his short stay with Detroit, he then moved on to the Brooklyn Superbas in an unknown transaction. For Brooklyn, he became a good hitter, batting .290 in both of his full seasons with them. After a slow start in 1906, he was traded to the Chicago Cubs in exchange for Hub Knolls on April 28.

He didn't play in the Majors for the 1907 season, but reappeared for the 1908 Boston Red Sox and batted .308, hit 14 triples, and led the American League in on-base percentage. The following season, manager Fred Lake announced that Doc would be team's Captain for the 1909 season. This situation did not last the season, as he was traded to the Washington Senators on September 9, 1909 in exchange for Charlie Smith. He played three seasons for the Senators and retired after the 1911 season.

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