Servando Bayo (October 27, 1822 – May 18, 1884) was an Argentine politician who served as the National Autonomist Party governor of the province of Santa Fe from April 7, 1874, to April 7, 1878. A native of Rosario, Bayo attended a military training institution and took part in the Battle of Cepeda with the rank of captain. As a politician, he was Rosario's Political Chief (comparable to a non-elected mayor), a senator, and governor of the province (with as his vice-governor). Bayo served in the Argentine Senate from 1881 until his death in 1884, replacing as senator for Santa Fe.