Armstead Milton Alexander (May 26, 1834 – November 7, 1892) was a lawyer who served as a member of the United States House of Representatives from Missouri. He was born in Winchester, Kentucky, and later graduated from Bethany College. Around 1848, he moved to the Paris, Missouri, area to become a blacksmith. In 1849, he joined the California gold rush, returning later to Paris, Missouri, to engage in business. During the American Civil War, he sided with the Confederacy, and served in the Confederate States Army.