Isidro Márquez Espinoza (born May 14, 1965) is a Mexican former professional baseball pitcher.

He played in Major League Baseball (MLB) for the Chicago White Sox.

Márquez played during one season at the major league level for the Chicago White Sox.

He was purchased by the Los Angeles Dodgers from the Mexican League's Tuneros de San Luis in 1988.

This biographical article relating to a Mexican baseball pitcher is a stub.