Background: Implantable cardioverter defibrillators (ICD) are an effective therapy method for the prevention of sudden cardiac deaths but, it may cause certain psychosocial problems in patients. Although the patients are especially under the risk of death anxiety and sleep disorders, there are no studies that discuss these phenomena together. This research was a descriptive study that aimed to examine the levels of death anxiety and sleep quality as well as their relationship in patients with ICD. Methods: The research was conducted between September 2018-February 2019 with 88 patients. The data were obtained by using the Patient Information Form, Pittsburgh-Sleep-Quality-Index and Templer Death-Anxiety-Scale. The data were analyzed with Shapiro-Wilk test, t-test, chi-squared test, Mann-Whitney-U test and variation analysis. Results: Death anxiety levels were higher in females under 50 years of age (p<0.001), and sleep quality levels were lower in patients with low economic status (p<0.001). Also, ICD shocks increased anxiety levels and significantly decreased sleep quality levels (p<0.05). The anxiety and problems related to ICD increased death anxiety significantly (p<0.05), and sleep quality decreased due to the increase in death anxiety levels, but this wasn’t statistically significant. Conclusion: ICD is associated with high levels of death anxiety and poor sleep quality in patients in Turkey. This study results are expected to promote biopsychosocial support for patients by planning proper interventions. In order to distinguish the effects of comorbid conditions and cultural traits on ICD experiences, it’s recommended that the results of the study are examined with future studies and different populations.