National Commission of the "Solidarity" Trade Union collects, develops, stores, and publishes archival materials of the "Solidarity" Trade Union. The Archives contain materials from the 1976-1990 period, such as:

• Records concerning national, foreign, regional, and specific company-level structures of the "Solidarity" Trade Union, including the National Coordinating Commission (Krajowa Komisja Porozumiewawcza), National Commission, National Executive Commission, and Regional Commissions of the "Solidarity" Trade Union, such as Gdańsk, Słupsk, Mazovian, Mid-eastern, Silesian-Dąbrowa, and company commissions of the "Solidarity" Trade Union;
• Records of social committees, organised and functioning within the framework of the "Solidarity" Trade Union structure;
• Heritage of "Solidarity"'s chaplains;
• Private collections, including letters of Lech Wałęsa from the 1983-1989 period;
• Collections of materials covering strikes and political events in Polish People's Republic, as well as journals, non-serial and independent publications by Solidarity Trade Union, Committee for Social Self-Defence KOR, Young Poland Movement, Free Trade Unions of the Coast et. al.;
• 2,500 posters and leaflets, i.a. from the March of 1968 and the December of 1970;
• 20,000 photographs, negatives, and printing matrices;
• Ca. 700 tapes and radio reels with recordings of Union’s statutory bodies’ sessions, "Solidarity" Trade Union activists’ interviews, satirical programmes, “independent” songs, and other Solidarity-related materials.