Ernesto Alfredo Castro Aldana (born 26 May 1971) is a Salvadoran politician and businessman who currently serves as the president of the Legislative Assembly of El Salvador.

Before entering politics, Castro worked as an external consultant to various companies and institutions, including serving as the general director of Grupo Tres y Punto.

[1] Castro resigned as Bukele's secretary and private advisor in 2020 to seek public office in the 2021 legislative election.

[11] Prior to assuming office as a deputy, an opinion poll conducted by La Prensa Gráfica from 20 to 26 April 2021 found that 6.6 percent of respondents believed that Castro would be the best option to serve as president of the Legislative Assembly, the highest percent received by any individual.

[17] Castro left office on 10 March 2023 and was succeeded by his vice president pro-tempore, Alfredo Pacheco of the Dominican Republic.

[27] Castro's projections were criticized by opposition politicians who described them as being "undemocratic" ("antidemocrática") and an attempt to "concentrate power" ("concentrar el poder").

In March 2023, Castro wrote on Twitter that "there is not even the slightest possibility" ("no existe ni la más mínima posibilidad") that the Nuevas Ideas-led Legislative Assembly would vote in favor of legalizing abortion.

[39] In February 2023, the El Faro digital newspaper revealed that Castro and Sol's cooking company, Sociedad Castro Sol S.A. de C.V., had received US$504,000 in 18 checks from Salvadoran President Mauricio Funes between September 2010 and August 2011 to provide food and cook for the Presidential Battalion.