Aims: To determine the relationship between perception of COVID-19, fear of COVID-19 and self-care management in individuals with chronic diseases during the pandemic process. Background: Individuals with chronic diseases are a sensitive group during the COVID-19 pandemic process; it is thought that self-care management may be adversely affected as a result of their more intense exposure to the psychological, physiological and economic effects of the pandemic. In the literature, there is no study examining the effect of perception of COVID-19 and fear of COVID-19 on self-care management in individuals with chronic diseases. Design: Descriptive study. Methods: The study was conducted with 322 individuals who applied to the internal medicine outpatient clinics of a university's Health Practice and Research Center, met the inclusion criteria, agreed to participate in the study and had a chronic disease. Questionnaire form, Perception of COVID-19 Scale (P-COVID-19), The Fear of COVID-19 Scale (FCV-19S) and Self-Care Management Process in Chronic Illness Scale (SCMP-G) were used to collect data. STROBE checklist was used to report the present study. Results: In the study, it can be stated that individuals with chronic diseases had a moderate to the high perception of contagiousness and dangerousness of COVID-19, they had a moderate-high level of fear of COVID-19 and their self-care care management was above moderate level. There was a significant positive correlation between P-COVID-19, FCV-19S and SCMP-G in the study. Conclusions: It was found that the perception of COVID-19 contagiousness and the fear of COVID-19 had a positive effect on the self-care management of individuals with chronic diseases. Relevance to clinical practice: Determining the level of COVID-19 perception and fear of COVID-19 and their effects on the life of the individual, and evaluating self-care management during the difficult pandemic process will increase the success in the holistic nursing care and management of chronic diseases.