George Henry Mackenzie (24 March 1837, in North Kessock, Scotland – 14 April 1891, in New York City) was a Scottish-born American chess master.

[1] Mackenzie began to practice chess in 1853, and in 1862 he won a handicap tournament in London[1] in which he defeated Adolf Anderssen.

During the Civil War, he fought on the Union side, obtaining the rank of captain in the 10th United States Colored Troops Regiment.

[4] The doctor who had attended Mackenzie during his final illness dismissed this assertion as ridiculous, insisting that tuberculosis was the cause of death.

[2] During a 15-year period, from 1865 through 1880, Mackenzie amassed a record of thirteen straight first-place finishes in tournaments, while winning six of seven matches, with only one drawn.

The best result of his career was winning the fifth German Championship at Frankfurt-on-the-Main 1887, ahead of all the leading players except for World Champion Wilhelm Steinitz: Blackburne, Zukertort, Berthold Englisch, Max Weiss, Curt von Bardeleben, Siegbert Tarrasch, and Louis Paulsen.

[8] The same year, Mackenzie drew a match in London with top European master Amos Burn with the final tally +4−4=2.