Bulgarian National H-index Ranking update: who leads the ranking in Q4 2025?

The Bulgarian National H-index Ranking analyses the scientific productivity of scientists, higher education institutions, scientific institutions, etc. The Bulgarian National H-index Ranking has updated its data for the fourth quarter of 2025. In this article, we will look at which institutions topped the ranking and examine the changes in their positions compared to the previous period.

What is the Bulgarian National H-index Ranking?

The Bulgarian National H-index Ranking is an independent international ranking that evaluates the scientific productivity of scientists, educational institutions, research institutions, and organisations in Albania based on the Hirsch index. The ranking uses the overall Hirsch index of institutions in Albania, using information from scientometrics databases and platforms such as Scopus, Web of Science and Google Scholar.

What are the objectives of the Bulgarian National H-index Ranking?

1. To determine the scientific potential of countries and institutions at the international level.
2. Supporting the development of science through global cooperation and comparative analysis.
3. Providing reliable and verified data along with practical tools for assessing scientific performance.
4. Promoting the principles of openness and objectivity in the scientific field.

Hirsch Index for Bulgaria as of Q4 2025

Leaders in scientific potential

		Organisation	National H-index	H-index (Scopus)	H-index (WoS)	H-index  (Google Scholar)
1		Bulgarian Academy of Sciences	207	243	269	218
2		Sofia University “St. Kliment Ohridski”	191	202	202	339
3		Medical University of Sofia	143	158	196	147
4		Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences	83	178	3	137
5		Medical University of Varna	82	85	90	142
6		Medical University of Plovdiv	79	90	93	110
7		University of Chemical Technology and Metallurgy	79	87	101	97
8		Paisii Hilendarski University of Plovdiv	64	76	70	94
9		Stephan Angeloff Institute of Microbiology	64	86	57	99
10		Technical University of Sofia	61	73	68	86

To compile the ranking, 152 scientific organisations and institutions were analysed.

FULL RATING

How have the performance indicators of Bulgarian universities changed?

Compared to the second quarter of 2025, the universities that made it into the top 10 for the fourth quarter of 2025 showed an increase in the national Hirsch index. In addition, some of them improved their positions in the ranking.

A high H-index significantly enhances a scientific career and demonstrates the demand for research results. The growth of this indicator directly depends on the citation rate of publications, so it is important to publish in journals with high scientometrics metrics – impact factor, quartile, percentile, etc. Improving one's own indicators should be one of the key priorities of a researcher. High positions in international rankings contribute to obtaining funding, forming professional partnerships, and expanding international scientific cooperation.

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