Martin Luther Smith was an American soldier and civil engineer, serving as a major general in the Confederate States Army. Smith was one of the few Northern-born generals to fight for the Confederacy, as he had served most of his early military career in the South with the United States Army's topographical engineers, marrying a native of Athens, Georgia. He planned and constructed the defenses of Vicksburg.

The general officers of the Confederate States Army (CSA) were the senior military leaders of the Confederate States of America during the American Civil War of 1861–1865. They were often former officers from the United States Army before the Civil War, while others were given the rank based on merit or when necessity demanded. Most Confederate generals needed confirmation from the Confederate States Congress, much like prospective generals in the modern U.S. armed forces.