|Death||18 June 1596 (Michoacán, Mexico)|
Alfonso Guerra OP (died 18 June 1596) was a Roman Catholic prelate who served as Bishop of Michoacán (1592-1596) and Bishop of Paraguay (1579-1592).
Alfonso Guerra was ordained a priest in the Order of Preachers. On 6 February 1579, he was appointed during the papacy of Pope Gregory XIII as Bishop of Paraguay. On 9 March 1592, he was consecrated bishop by Toribio Alfonso de Mogrovejo, Archbishop of Lima, with Antonio Avendaño y Paz, Bishop of Concepción; Sebastián Lartaún, Bishop of Cuzco; and Diego de Medellin, Bishop of Santiago de Chile, serving as co-consecrators. On 9 March 1592, he was appointed during the papacy of Pope Clement VIII as Bishop of Michoacán. He served as Bishop of Michoacán until his death on 18 June 1596.