|Full name||José Guillermo Rivera Escobar|
|Date of birth||November 25, 1969|
|Place of birth||San Rafael Cedros, El Salvador|
|Height||1.80 m (5 ft 11 in)|
|2008||Marte de Soyapango|
|2009||El Salvador U-17|
|2010–2011||El Salvador (Assistant)|
|2013||Santa Tecla F.C. (interim) and (Assistant coach)|
|* Senior club appearances and goals counted for the domestic league only
He is currently the manager of Marte Soyapango.
Nicknamed Memo, Rivera came through the youth ranks at FAS, where he would stay for over a decade and win two league titles. In 1999, he moved abroad for a stint at Guatemalan side USAC. He returned to El Salvador to play for Salvadoran second division side Isidro Metapán alongside fellow international William Renderos Iraheta and finished his career at Once Lobos.
Rivera made his debut for El Salvador in 1988 and has earned a total of 74 caps, scoring 15 goals. He has represented his country in 22 FIFA World Cup qualification matches and played at the 1991, 1993, 1995 and 1999 UNCAF Nations Cups and was a non-playing squad member at the 1996 CONCACAF Gold Cup but did play at the 1998 CONCACAF Gold Cup.
His final international game was an August 2000 FIFA World Cup qualification match against Jamaica.
- Scores and results list El Salvador's goal tally first.
Rivera is married and has two children.
- Isidro-Metapán y Jocoro inician batalla - La Prensa Grafica (in Spanish)
- Guillermo Rivera – FIFA competition record
- UNCAF Tournament 1995 - RSSSF
- UNCAF Tournament 1999 - RSSSF
- CONCACAF Championship, Gold Cup 1996 - Full Details - RSSSF
- CONCACAF Championship, Gold Cup 1998 - Full Details - RSSSF