Giles Alexander Smith (September 29, 1829 – November 8, 1876), was a general in the Union Army during the American Civil War.

He took part in the capture of Fort Donelson, the Battle of Shiloh, and the operations against Corinth, becoming, later in 1862, colonel of a regiment which he led at Chickasaw Bayou.

[3] He was appointed to the rank of major general of volunteers on November 24, 1865, the last one based on seniority for the Civil War.

[4] His brother Morgan Lewis Smith was a Union Army brigadier general of volunteers.

He moved to California in 1874 in a futile attempt to improve his health, but returned to Illinois two months before his death.