At universities for students, the COVID-19 pandemic and the introduced anti-pandemic measures turned out to be psycho-traumatic factors that increased the experience of loneliness. The purpose of the study was to investigate the prevalence of the phenomenon of loneliness among university students in five European countries, taking into account the variety of anti-COVID measures during the COVID-19 pandemic. Using the UCLA Loneliness Scale, questionnaires of 2316 students. In Russia, Poland and Ukraine a hard lockdown was introduced during the pandemic. Lithuania (in the first months) did not undertake severe restrictions, and for a long time the danger of the SARS-CoV-2 virus was not recognized in Belarus. The students in Lithuania and Belarus, 33 and 35 points. Students from Poland, Russia and Ukraine: 38, 37, 37 points, respectively. All respondents were classified according to three levels of loneliness experience. A low level (<40) was noted in 1,510 cases (65.2%), medium (40‒60) — 740 people (32.0%), high (>60) experience of loneliness — 66 respondents (2.8%). Among the representatives of Lithuania and Belarus, a low level of subjective feeling of loneliness prevailed (about 70% of respondents), while in Ukraine, Russia and Poland the share of low indicators was significantly less, respectively, 65.2%, 59.8% and 57.8%. University students from five countries who participated in the study do not experience high levels of loneliness. Gradation of the prevalence of feelings of loneliness from minimum to maximum in comparison is as follows: LT — BY — RU—UA—PL. The severity of loneliness is associated with the levels of restrictions in the countries during the pandemic.