Mercedes Chilla López (born January 19, 1980, in Jerez de la Frontera, Cádiz) is a javelin thrower from Spain.
Chilla is the Spanish record holder for the event, with a best mark of 64.07 metres, and has won medals at the Mediterranean Games and the Ibero-American Championships.
In 2005, she enjoyed success at the regional level with another javelin bronze at the 2005 Mediterranean Games and she improved on her previous global competition performance with a fifteenth-place finish at the 2005 World Championships in Athletics.
She capped off a successful season with a personal best and Spanish record throw of 63.20 metres at the Herculis meeting in August 2006.
[2] This mark made her fifth in the world rankings and demonstrated her potential to return to the podium at the 2010 European Athletics Championships.