Óscar Esaú Duarte Gaitán (born 3 June 1989) is a Nicaraguan-born Costa Rican professional footballer who plays as a centre-back for La Liga club Levante.
Born in Nicaragua, Duarte represents the Costa Rica national team.
Duarte was born in Catarina, Masaya, Nicaragua. After making 52 appearances in five years at Costa Rican club Deportivo Saprissa, Duarte joined Club Brugge in the Belgian Pro League in 2013.
In May 2018 he was named in Costa Rica’s 23-man squad for the 2018 FIFA World Cup in Russia.