John Corson Smith (February 13, 1832 – December 31, 1910) was an American military officer and politician from Pennsylvania. Coming to Galena, Illinois in 1854, Smith first practiced carpentry before receiving a commission at a customhouse. Smith fought in the American Civil War with the 96th Illinois Volunteer Infantry Regiment and was brevetted a brigadier general for his actions at the Battle of Chickamauga. Returning to Galena, Smith work in Internal Revenue until moving to Chicago, Illinois in 1874. There, he was named Chief Grain Inspector, then was elected Illinois Treasurer (1879–1881, 1883–1885). He was elected Lieutenant Governor of Illinois in 1884. Smith was also a prominent Freemason, leading the Illinois chapter and serving as Grand Scribe for twenty-five years.