The results of the International Conference on ″Modern Problems of Hydrogeology, Geology Engineering and Hydrogeoecology of Eurasia″ are published in these Proceedings. The conference was held in National Research Tomsk Polytechnic University and dedicated to the 85th anniversary of Hydrogeology, Engineering Geology and Hydrogeoecology Department. The Department was one of the first in Siberia and the first beyond the Urals and was established in 1930 due to the intensive mining industry, natural resources development, population growth, underexplored hydrogeological and geo-engineering conditions, and absence of qualified engineering staff in Siberia.Despite the challenges, the department was intensively developing and trained highly in demand qualified engineers. Since then about 3000 engineers, 500 Bachelors (since 1993), more than 100 Masters, 160 Candidates of Science and 30 Doctors of Science have received a degree at the department. Today, among the alumni of the department there are heads of big companies, university rectors, directors of scientific organizations, members of academies and expeditions and recipients of national awards.The research fields of the department, as well as teaching strategies and techniques applied for training qualified engineering and research staff constituted the basis for the conference's scientific fields. Precisely, the conference covered issues in such areas as hydrogeology, groundwater geochemistry, water body contamination, migration of chemical elements, application of up-to-date modeling techniques for understanding the principles of different water types' formation, groundwater mapping methods and drilling, etc.The conference reports revealed that the groundwater of Eurasia, including both the top hydrodynamic zone and deep water horizons (up to 3-4 km), are being intensively studied. The main focus was laid to the oil and gas production regions. It was stated that the mineralization of such water reaches 500 g/l. Such strong brines are typical within the Siberian platform. It is an interesting fact that not only Cl-Na brines, but also Cl-Ca ones, the genesis of which is rather controversial, can be met within this territory.A great number of the reports demonstrated that water-host rock non-equilibrium is typical within Siberia. It implies not only low-salinity water but also strong brines. The character of the phenomenon being not always clear, the participants proposed different viewpoints on the issue.Modeling of hydro-geochemical processes in the water-rock system was the focus of a significant number of the reports. Also, these processes are studied via isotope analysis of different chemical types of water with dissolved salts and gases (isotopes of O, H, N, C, Sr, Cl, Br, He, S, etc.).The greatest attention of most reporters was paid to such critical geo-engineering issues as urban underground areas development, urban agglomeration infrastructure, territory zoning and classification, hazardous geocryological processes along main oil and gas pipelines, conditions of geo-environmental components, mining activities and ground base modeling.The modern hydrogeology and engineering geology focused on geoecological conditions and environmental protection, which has determined the scope of the conference. The participants discussed the environmental impact caused by the mining companies (water and soil contamination and flora impact), ecological conditions in urban areas, the environmental impacts of waste water effluents, geological factors connected with the population health and drinking water quality, as well as the solutions for environmental crises.Youth Research School was organized within the conference. Four lectures were delivered by the professors of different universities and institutes: 1) S.L. Shvartsev (TPU) “Aquagenetic Theory of Environment Evolution”; 2) B.N. Ryzhenko (VIGAC RAS) “Geochemical Processes Modeling within the Water-Rock-Gas System to Solve Fundamental and Engineering Problems”; 3) O.N. Gryaznov (USMU) “Engineering-Geological Zones of the Ural”; (4) S.O. Grinevskiy (MSU) “Geohydrological Modeling in Groundwater Resource Estimation”. Besides, there were 35 student reports from 9 Russian Universities. Some of the reports were published in the Proceedings.