Ibsen Adalberto Castro Avelar (born 24 October 1988) is a Salvadoran professional footballer who plays as a defender for Primera División club FAS.
Castro was born in Quezaltepeque, La Libertad, and played youth football with Atlético Marte before joining the first team in 2010.
He made his first team debut 2010 and amassed 72 appearances and scored 6 goals for Los Marcianos during a two-year spell.
With Águila, Castro disputed the finals of the Apertura 2014 and the Clausura 2016, but they were defeated by Isidro Metapán (on penalties) and Dragón (0–1) respectively.
He was called up for the 2014 Copa Centroamericana and started the first group stage game, a 2–1 loss against Guatemala, in an eventual fourth-place finish for El Salvador.