Alonzo Smith (August 9, 1842 - January 17, 1927) was an American soldier who fought for the Union Army during the American Civil War.

He received the Medal of Honor for valor.

Smith served in the American Civil War in the 7th Michigan Volunteer Infantry Regiment.

He received the Medal of Honor on December 1, 1864 for his actions at the Battle of Boydton Plank Road on October 27, 1864.

Citation: Capture of flag of 26th North Carolina Infantry (C.S.A.