The Third Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons was held in Geneva from 27 August to 21 September 1985, with a view to assuring that the purposes and provisions of the Treaty were being realized. The Conference ended with the adoption by consensus of a Final Declaration, by which the States parties, among other things, solemnly declared their conviction that the Treaty was essential to international peace and security and expressed their support for its objectives. This Fact Sheet provides information on the preparations for the Conference, developments at the Conference and the main features of the Final Declaration. The text of the Treaty is reproduced in Disarmament Fact Sheet No. 33, and its historical background is contained in Fact Sheet No. 41.