president of Nicaragua (1956–63), successor to his father, Anastasio Somoza Debayle (Somoza Debayle, Anastasio), who had been assassinated. Luis Somoza also chose and controlled his successors, Rene Schick Gutiérrez (served 1963–66) and Lorenzo Guerrero Guitérrez (1966–67).

The elder son of his father, Somoza attended La Salle Military Academy in New York and, at 18, was made a captain in the Nicaraguan National Guard. From 1950 he served first in the Chamber of Deputies and then in the Senate. As president of his country, he was known for civilian-oriented, liberal administration. He relaxed political controls and did much to modernize the country, instituting many economic and social reforms. He reinstated a ban on consecutive presidential terms and on immediate presidential succession by relatives. He worked to improve the domestic economy and developed better relations with other Central American countries.

When he stepped down from office in 1963 after picking his successor, he became a senator, a position he held until his death. Despite his relatively progressive views, he never allowed his family's firm hold on Nicaraguan politics to be relinquished.