Agostina Hein (born 24 April 2008) is an Argentine swimmer specializing in individual medley and freestyle. She holds three South American records in 800 metres freestyle, 200 m medley, and 400 m medley. She won gold in the 400 m medley at the 2025 World Aquatics Junior Swimming Championships. At the 2026 Pan Pacific Swimming Championships, she finished third in the 400 m medley, breaking her own national and continental record.
She represented Argentina at the 2024 Summer Olympics, where she was the youngest athlete in the Argentina delegation at age 16.
Career Hein started swimming at age three and was competing by age seven with Club Ciudad de Campana. At age 11, she started working with coach Sebastián Montero, who she followed to SER Natación Alto Rendimiento de Zárate, her current club.
In 2022, at age 14, Hein participated in the 2022 South American Games, her first major international competition. She won silver in the 4 × 200 metre freestyle relay with the Argentine team.
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