Association of Free Trade Unions of Slovenia

{{Infobox union

|name = ZSSS

|location_country= Slovenia

|affiliation = ETUC

|members = 300,000

|full_name = Association of Free Trade Unions of Slovenia

|native_name = Zveza svobodnih sindikatov Slovenije

| image = ZSSS logo.png

|founded =

|dissolved =

|merged =

|headquarters = Ljubljana, Slovenia

|key_people = Dušan Semolič, president
Milan Utroša, general secretary

|website = [http://www.sindikat-zsss.si www.sindikat-zsss.si]

|footnotes =

}}

The Association of Free Trade Unions of Slovenia ({{langx|sl|Zveza svobodnih sindikatov Slovenije}}) (ZSSS) is the largest national trade union center in Slovenia, with a membership of 300,000. It was formed from the remains of the old Yugoslav-era unions.

The ZSSS has control of all four of the trade union seats in the National Council of Slovenia, and is affiliated with the European Trade Union Confederation.