The International Zone of Iran Nano 2013 hosted the Nanotechnology achievements of researchers from the four countries of South Korea, Romania, Lebanon and Russia. Taking into consideration the important position of Iran in nanotechnology among the countries active in this field, the purpose of organizing International Zone of Iran Nano 2013 was to increase the cooperation of Iran with other countries in the field of nanotechnology. Romania participated in Iran Nano Festival for the first time. It put on display its achievements in the field of magnetic nanostructured materials. In addition to presenting its achievements in the stall, the stall authorities paid a visit to other countries’ stalls and discussed different issues with researchers from other countries. They also got familiar with the progresses of other countries in the field of nanotechnology. Russia was another country that participated in Iran Nano 2013. It presented its achievements in the field of advanced and nanostructured ceramics. South Korea was the other guest of Iran Nano 2013. The country displayed its products and achievements in the field of nanomaterials and nanostructures. The other guest of International Zone of Iran Nano 2013 was Lebanon. The country’s stall consisted of a consortium of various Lebanese universities, and they showcased their scientific achievements in the field of nanotechnology. During the days of holding Iran Nano 2013, the ambassadors of a number of countries, including Brazil, Ecuador and Bolivia paid a visit to the festival as well as a number of 14 charges d’affaires from various countries.