Julio César Chávez González (Spanish pronunciation: ; born July 12, 1962), also known as Julio César Chávez Sr., is a Mexican former professional boxer who competed from 1980 to 2005. He is considered by acclamation as the greatest Mexican boxer of all time, and one of the greatest boxers of all time.
Chávez is a six-time world champion in three weight divisions, and for several years was considered the best active boxer in the world, pound for pound. During his career he held the WBC super featherweight title from 1984 to 1987; the WBA lightweight title from 1987 to 1989; the WBC lightweight title from 1988 to 1989; the WBC light welterweight title twice between 1989 and 1996; and the IBF light welterweight title from 1990 to 1991. Additionally, he held The Ring magazine lightweight title from 1988 to 1989, and the lineal light welterweight title twice between 1990 and 1996. Chávez was named Fighter of the Year for 1987 and 1990 by the Boxing Writers Association of America and The Ring magazine respectively.