Tehran University of Medical Sciences ranked 497 in Leiden Ranking System.

Amirkabir University of Technology, Sharif University, Tarbiat Modares University and University of Tehran are four universities from Islamic Republic of Iran which highlighted in this ranking system.

World's top 500 universities are ranked based on scientific performance and some bibliometric indicators.The Leiden Ranking offers more advanced indicators of scientific impact and collaboration and uses a more transparent methodology. The Leiden Ranking does not rely on highly subjective data obtained from reputational surveys or on data provided by universities themselves. New features in this ranking system  include an indicator of university-industry collaboration and the possibility of excluding publications in special types of journals (e.g., non-international journals, trade journals, and popular magazines).