Background and Objectives: Recent years have seen tremendous growth in international collaboration between researchers around the world. This phenomenon and its benefits are considered by the scientific policymakers. There are many forms of scientific collaboration and co-authorship is one of the most sensible, documented, and standard forms. The purpose of this study was to study and map the scientific cooperation of Semnan University researchers at the international rank. Methodology: Data was gathered from documents indexed on WoS core collection. The authors were those who mentioned Semnan University as their affiliation. This study covered a period from 1900 to 2018. Thus, 3973 documents were collected. According to the purpose of this study, we only used university to university and country to country coauthor. We also chose documents that were prepared in collaboration with researchers from Semnan University and a researcher from foreign universities. We used VOSviewer, Ucinet and NetDraw software to analyze social networks, extract centrality measures, and map social networks. Findings: The findings showed that Hanyang, Malaya, Daejin and Gyeongsang Natl universities have the highest number of co-authors with Semnan University (Degree). The universities of Malaya, Texas A&M, King Abdulaziz, Hanyang, and Kebangsaan Malaysia ranked in the top according to ncloseness. The universities of Malaya, King Abdulaziz, Texas A&M, and Hanyang had the highest betweenness. In total, Semnan University has had the largest number of co-authors with universities in the United States, South Korea, Canada, Malaysia, and Poland. A study of the growth of scientific productions of Semnan University researcher’ s co-author with foreign universities indicates that despite some ups and downs, there is an increasing trend. The highest number of collaborations was done in 2018. A review of scientific journals that published co-authored papers with foreign researchers found that THE JOURNAL OF INEQUALITIES AND APPLICATIONS and JOURNAL OF COMPUTATIONAL ANALYSIS AND APPLICATIONS topped the list. Mathematics and engineering were the most popular topics in international co-authored documents and Gorji was a prominent Semnan University researcher in international co-authorship. Discussion: This study showed that Semnan University researchers had appropriate co-authorship with researchers from different countries and universities in the fields of engineering and basic sciences, but humanities researchers have not been very active in this regard.