Agustín Sienra (born 14 July 1999) is an Argentine professional footballer who plays as a centre-back for Spanish club CD Castellón.
Career Sienra started off his career with Defensores Santa Catalina, before later signing with Newell's Old Boys. In 2016, following a trial, Sienra joined the youth system of Defensa y Justicia. He made the move into first-team football towards the back end of 2020, appearing as an unused substitute for Copa Libertadores matches with Delfín (twice) and Olimpia and a Copa de la Liga Profesional encounter with Colón between September and November. It was in the latter month that the centre-back made his senior debut, as he featured for seventy-nine minutes of a domestic defeat to Central Córdoba on 29 November.
On 5 August 2021, Sienra was loaned to Villa San Carlos until December 2022. On 5 January 2023, he moved to San Martín de San Juan also in a temporary deal.
Sienra helped San Martín to achieve promotion to the top tier in 2024, before returning to Defensa for the 2025 season. On 7 July of that year, after just three further first team appearances, he moved abroad and signed a one-year deal with Spanish Segunda División side Castellón.
Career statistics . + Appearances and goals by club, season and competitionClubSeasonLeagueCupContinentalOtherTotalDivisionAppsGoalsAppsGoalsAppsGoalsAppsGoalsAppsGoalsDefensa y Justicia2020–21Primera División200000—202021100000—102025201000—30Total501000—60Villa San Carlos (loan)2021Primera B Metropolitana?000——?02022?000——?0Total31000——310San Martín de San Juan (loan)2023Primera Nacional14020——160202437010——380Total51030——540Castellón2025–26Segunda División0000——00Career total870400000910
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