Objectives: We sought to identify subgroups of psychiatric patients in a sample of patients admitted at a tertiary care hospital in Oman who received electroconvulsive therapy (ECT) based on their demographic and clinical outcomes. Methods: We retrospectively collected data from patients who received ECT at Al Massarah Hospital, Muscat, Oman, between January 2015 and December 2019. Sociodemographic characteristics, clinical profiles, and psychiatric comorbidities were examined. Results: A total of 179 psychiatric patients received ECT; 96 (53.6%) were females. The average age at diagnosis was 42.5 years. Two-step cluster analysis showed 70 (39.1%) patients in cluster one and 109 (60.9%) patients in cluster two. Patients in cluster one included more (61.4%) females, were older (mean = 55.2 years), married (95.7%), and unemployed (88.6%). They reported they had comorbidities (55.7%) and less frequent ECT use (mean = 8.7) than patients in cluster two. Clusters differences were found on gender (p = 0.001), age (p < 0.001), marital status (p < 0.001), and occupation (p = 0.001). Significant differences were found for diagnosis (p < 0.001), comorbid medical conditions (p < 0.001), and use of ECT sessions (p = 0.006). Conclusions: Psychiatric patients receiving ECT are heterogeneous, with different demographic and clinical outcomes. Our study has shown that patients in cluster one are older females, unemployed, with more comorbidities, and depressive disorders, but received fewer ECT sessions. This study provides important information for clinicians to identify strategies to promote the use of ECT on its effectiveness and safety issues for each group.