George Alexander Forsyth (November 7, 1837, – September 12, 1915) was a United States military officer most notable for his service in the cavalry.

Forsyth enlisted on April 19, 1861, as a private in Barker's Company, Chicago Volunteer Dragoons (a 3-month regiment) and mustered out on August 18, 1861.

He also fought in many cavalry actions in the Shenandoah Valley, where he served as aide-de-camp to Maj. Gen. Philip Sheridan and received a brevet promotion to colonel on October 19, 1864, for his service at Third Winchester and Cedar Creek.

He was appointed a brevet brigadier general of volunteers on March 13, 1865, part of widespread ceremonial promotion of officers at the end of the war.

On April 23, 1885, at Fort Bowie, Arizona, he married Natalie Sedgewick Beaumont, the twenty-two-year-old daughter of fellow 4th Cavalry officer Eugene B.