Mabel Fonseca Ramírez (born May 8, 1972) is a retired amateur Puerto Rican freestyle wrestler, who competed in the women's lightweight category.

[2] Throughout her sporting career, Fonseca trained as a member of the women's wrestling team for Esporto San Juan under her personal coach Reinaldo Jimenez.

[3][4] When women's wrestling made its debut at the 2004 Summer Olympics in Athens, Fonseca qualified as a lone wrestler for the Puerto Rican squad in the 55 kg class.

[5][6] In the prelim pool, Fonseca pinned Ukraine's Tetyana Lazareva in her opening match, but fell behind Sweden's Ida-Theres Karlsson with a similar disposition before reaching the minute mark.

Despite missing a spot for the semifinals, Fonseca had a chance to edge past U.S. wrestler Tela O'Donnell 10–7, and China's Sun Dongmei 8–6 in overtime during the classification rounds.