ENIn this article, the authors combined their efforts and turned their attention to the study of economic aspects of security, specifically to the assessment of investment security in the regions as a factor of investment environment. When assessing an investment environment for a strategic investor, it is important to assess not only the investment potential in the region, but also the investment security. Poor security can result in financial losses under the uncertain conditions of investment activity, as well as the complete or partial bankruptcy of investment project. The assessment of investment security in Latvian regions (Riga, Pieriga, Vidzeme, Kurzeme, Zemgale, and Latgale) and Lithuanian regions (Vilnius, Alytus, Utena, Panevezys, Kaunas, Klaipeda, Marijampole, Taurage, Telsiai, and Siauliai counties) as a complex phenomenon has been carried out according to the methodology developed by the authors on the basis of statistical indicators [p. 104-105].