Francisco Solano López Carrillo (24 July 1827 – 1 March 1870) is president of Paraguay from 1862 until his death in 1870.

He is officially the eldest son of president Carlos Antonio López, whom he succeeds; however, his mother reveals to him that he was born out of wedlock.

Solano López is widely regarded as being responsible for the War of the Triple Alliance, which leads to his death.