Franklin Guest Smith (February 16, 1840 – October 7, 1912) was a career officer in the United States Army. A Union Army veteran of the American Civil War, Smith also served in the American Indian Wars and the Spanish–American War, and attained the rank of brigadier general. After the war, Smith commanded the Artillery District of Portland, Maine. On August 3, 1903, Smith was promoted to brigadier general, and he retired on August 4. In retirement, Smith resided in Washington, D.C. He died in Washington on October 7, 1912 and was buried at Arlington National Cemetery.