The Third Zimmerwald Conference or the Stockholm Conference of 1917 was the third and final of the anti-war socialist conferences that had included Zimmerwald (1915) and Kienthal (1916).
The Third Zimmerwald Conference was originally called so that the Zimmerwald parties could discuss their attitude toward a proposed general conference of socialist parties in that had been called by Petrograd Soviet and Dutch-Scandinavian Committee that had included the members of the old International Socialist Bureau. As this conference kept being postponed, so was the Zimmerwald meeting that was supposed to assemble before it, until late July 1917 when the International Socialist Commission decided to hold its own meeting regardless of what happened to the plans for the proposed general conference for September 5–12, 1917.
The following delegates attended the conference.
The International Socialist Commission was represented by Angelica Balabanoff, Ture Nerman, Carl Hoglund and Carl Carlson. Lindhagen was appointed chairman of the presidium of the Conference and Balabanoff its secretary.
The conference first heard reports from the ISC on its general operations and on the Grimm Affair. The conference approved of both reports. Next reports were heard on the progress of the Zimmerwald movement in various countries. Schlesinger spoke for Austria, Nissen for Norway, Sirola for Finland, Constantinescu for Romania and Rozin for the United States. Written reports were received from countries whose delegates had been unable to attend the conference because their passports had been denied, particularly Entente countries. Messages or greetings from Klara Zetkin, the Netherlands and the French Zimmerwaldists had already been received at the opening of the conference. On September 10, additional reports were made on the situation in Great Britain, France and Italy by members of the Petrograd Soviet who had just visited those countries. The Soviet representatives who made this report were Nikolai Rusanov, Hendrik Ehrlich and Yosef Goldberg.