 Afghanistan
 Algeria
 Angola
 Armenia
 Azerbaijan
 Bangladesh
 Belarus
 Bulgaria 12 L-39ZA
 Cambodia
 Cuba
 Czech Republic
 East Germany Withdrawn from use in 1990.

 Egypt
 Equatorial Guinea
 Estonia
 Ethiopia
 France (The Breitling Jet Team currently uses nine L-39s)
 Georgia
 Ghana
 Iraq
 Kazakhstan
 Kyrgyzstan
 Libya
 Lithuania
 Latvia (The Baltic Bees Jet Team currently uses six L-39s)
 Mozambique
 Nigeria
 North Korea
 Romania
 Russia
 Slovakia
 South Sudan
 Syria
 Tajikistan
 Thailand L-39ZA/ART (Westernized version, equipped with Israeli avionics)
 Tunisia
 Turkmenistan
 Uganda
 Ukraine
 United States (The Patriots Jet Team currently uses six L-39s; The Black Diamond Jet Team currently uses six L-39s)
 Uzbekistan
 Vietnam
 Yemen
 Afghanistan
 Algeria
 Angola
 Armenia
 Azerbaijan
 Bangladesh
 Belarus
 Bulgaria 12 L-39ZA
 Cambodia
 Cuba
 Czech Republic
 East Germany Withdrawn from use in 1990.
 Egypt
 Equatorial Guinea
 Estonia
 Ethiopia
 France (The Breitling Jet Team currently uses nine L-39s)
 Georgia
 Ghana
 Iraq
 Kazakhstan
 Kyrgyzstan
 Libya
 Lithuania
 Latvia (The Baltic Bees Jet Team currently uses six L-39s)
 Mozambique
 Nigeria
 North Korea
 Romania
 Russia
 Slovakia
 South Sudan
 Syria
 Tajikistan
 Thailand L-39ZA/ART (Westernized version, equipped with Israeli avionics)
 Tunisia
 Turkmenistan
 Uganda
 Ukraine
 United States (The Patriots Jet Team currently uses six L-39s; The Black Diamond Jet Team currently uses six L-39s)
 Uzbekistan
 Vietnam
 Yemen
Aero L-39 Albatros