|Full name||William Adalberto Osorio Rivera|
|Date of birth||April 13, 1971|
|Place of birth||San Salvador, El Salvador|
|Height||1.71 m (5 ft 7 in)|
|1997-1998||Luis Ángel Firpo|
|* Senior club appearances and goals counted for the domestic league only and correct as of 26 April 2006.
† Appearances (Goals).
He currently is a coach at CD FAS, assisting technical director William Renderos.
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 won 6 league titles with FAS in two periods divided by a spell at Luis Ángel Firpo with whom he also won the league in 1998. 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 Salvadoran Premier Division.
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. Osorio has been a national team stalwart for over 10 years and has represented his country in 18 FIFA World Cup qualification matches over three campaigns and played at the 1991, 1993, 1995, 1997, 1999 and 2001 UNCAF Nations Cups, as well as at the 1996 and 2002 CONCACAF Gold Cups.
Osorio is married and has two sons.
- 1995, 1996, 1998, 2002 Clausura, 2002 Apertura, 2004 Apertura, 2005 Clausura
- William Osorio – FIFA competition record
- UNCAF Tournament 1995 - RSSSF
- UNCAF Tournament 1997 - RSSSF
- UNCAF Tournament 1999 - RSSSF
- Qualifying Tournament for Gold Cup 2001 - Details - RSSSF
- CONCACAF Championship, Gold Cup 1996 - Full Details - RSSSF
- CONCACAF Championship, Gold Cup 2002 - Full Details - RSSSF
- 26 mayo: El denominador común - El Diario de Hoy (Spanish)
- William Osorio at National-Football-Teams.com
- Profile - CD FAS (Spanish)
- ¿Qué PASó con... William Osorio ? - El Salvador.com (Spanish)