William Adalberto Osorio Rivera (born April 13, 1971) is a retired Salvadoran footballer.
After coming through at Coca-Cola, for whom he made his debut in 1987 while in the Salvadoran second division, Osorio started his top level career with FAS and made his debut in August 1990 against Fuerte San Francisco.
He was a long time captain of FAS and after leaving FAS in the summer of 2005, he also played professionally for Isidro Metapán and Chalatenango of the Primera División de Fútbol de El Salvador.
Osorio made his debut for El Salvador in an April 1991 UNCAF Nations Cup qualification match against Nicaragua and has earned a total of 67 caps, scoring no goals.
[7] His final international game was a January 2002 CONCACAF Gold Cup match against the United States.