The relevance of this article is based on the aim to fulfill the lack of understanding of public perception on energy security. Despite the fact that energy security problems in Lithuania are analyzed on a regular basis, however, there is no comprehensive research on the very issue of the public perception of energy security. The results of the empirical survey (public poll carried out in 2013) are used to explain the public perception of energy security and its main aspects, and to show the existing difference of society opinion between different social groups in regard to gender, age, education, occupation, income and living area. The research showed that variety of different aspects are taken into account in public perception on energy security. The dominance of “The prices of energy resources” (mean – 4.35) and “Reliability of energy supply services” (mean – 4.25) was fixated throughout different social groups. The three most ambivalently ranked aspects were “Development of oil extraction” (mean – 3.50), “Development of nuclear energy” (mean – 3.30) and “Development of shale gas extraction” (mean – 3.08).