Countries that do NOT need a visa to enter El Salvador:
Argentina, Austria, Belgium, Chile, Costa Rica, Denmark, Finland, France, Germany, Guatemala, Honduras, Iceland, Ireland, Israel, Italy, Japan, Liechtenstein, Luxembourg, Netherlands, Nicaragua, Norway, Panama, Paraguay, Republic of Korea, Spain, Sweden, Switzerland, Turkey, United Kingdom of Great Britain and Northern Ireland, Uruguay.
Countries that do NOT need a consular visa to enter El Salvador in diplomatic or official passports (ordinary passport holders of these countries NEED a consular visa):
Belize, Bolivia, Dominican Republic, Jamaica, Mexico (Official Passports need a visa), Republic of China (Taiwan), Russian Federation.