Miriam Casillas García (born 24 June 1992) is a Spanish triathlete.

She competed in the women's event at the 2016 Summer Olympics held in Rio de Janeiro, Brazil.

She won her first Super League Triathlon event podium at the SLT Malibu 2022, where she came 2nd.

[4] She competed in the women's triathlon at the 2024 Summer Olympics in Paris, France.

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