María de la Soledad Casado Estupiñán (born 11 October 1956) is a Spanish sports administrator and triathlete.

[2] Marisol is the only woman to preside over an International Summer Sport Federation and one of (only) two in the entire Olympic program, the other being Kate Caithness of curling.

In 1991, she obtained an MBA in Sports Administration and Management from the Complutense University of Madrid and the Spanish Olympic Committee.

At the end of the eighties she was a member of the Spanish Triathlon Federation, where, from its inception - except for a brief absence between 1994 and 1997 - until 2008, she held the position of Secretary General.

Casado was re-elected in 2012 at the XXV Congress in Auckland (New Zealand), in which she defeated the South Korean Kyung-Sun Yu, by 82 votes to 33.

In 2010, at the 122nd IOC session in Vancouver, she was elected as member of the International Olympic Committee, enduring as long as she is the President of the ITU.

The International Triathlon Union has promoted gender equality, and governing body quotas (20% women minimum) since its inception under the guidance of Marisol Casado and previous ITU president, Les McDonald.

Her main mandate of her four-year term was the inclusion of mixed triathlon relay (two women and two men) at the Tokyo 2020 Games, which has been achieved.