<b><i>Introduction:</i></b> In recent years, there has been an increase in the number of systemic fungal infections among HIV-infected individuals. The article aimed to examine the frequency of invasive mycoses among the HIV-infected patients at the time of their urgent and/or planned admission to a specialized hospital. <b><i>Methods:</i></b> The diagnostic methods used in this study involved physical examination, laboratory testing, bacteriological examination, immunological examination, molecular genetic testing, and radiological imaging. The study was conducted under the ethical guidelines for retrospective studies and does not disclose data on individual patients. <b><i>Results:</i></b> Between 2016 and 2018, 85 HIV patients who died with HIV history underwent a series of clinical and pathomorphological examinations at the Novgorod Regional Infectious Diseases Hospital. Systemic mycoses frequently occur in the respiratory system and less often in the brain. Their incidence is severe and the mortality rates associated with it are high. In this study, PCP was the most common cause of death provoked by mycoses. <b><i>Discussion/Conclusion:</i></b> Systemic fungal disease can be diagnosed through a combination of diagnostic methods. A crucial factor in the reduction of mortality rates for systemic mycosis is the early diagnosis and intensive antimicrobial therapy.