Confederation of Autonomous Trade Unions of Serbia is a trade union organization with the longest tradition in Serbia. It was born on March 9 1903 by a decision of various professional and local organizations (created in the second half of the 19th century), to associate and establish, for the first time in Serbian history, one trade union confederation - the Workers’ Confederation of Serbia. Federations of workers in the branches of construction, metal manufacturing, commerce and printing as well as Workers Society of Belgrade participated in its creation.

Today, The Confederation is composed of 29 professional federations and 106 local confederations, covering all professions and the whole Serbia. According to the latest data based on application cards, it has about 850 000 members (80% of them paying regularly their membership fees). Membership in the organization is voluntary.