Simpson Harris Morgan (1821 – December 15, 1864) was a lawyer, farmer, and railroad promoter who served in the Confederate States House of Representatives from Texas. Born in Tennessee, Morgan moved to Texas, where he eventually settled in Clarksville and practiced law. He also farmed and served as the president of the Memphis, El Paso and Pacific Railway. In 1863, he defeated incumbent William Bacon Wright for a seat in the Confederate House of Representatives in the Second Confederate Congress. In Congress, Morgan generally supported strengthening the Confederate central government, although he opposed certain agricultural taxes. While traveling to the second session of the Second Confederate Congress, Morgan died of pneumonia at Monticello, Arkansas.