Objectives: The study aimed to identify subgroups of psychiatric patients in a sample of patients admitted at a tertiary care hospital in Oman who received ECT based on their demographic and clinical outcomes. Methods: Data from adult patients who received ECT at Al-Massarh hospital, Muscat, Oman, were retrospectively collected from medical records from January 2015 to December 2019. Socio-demographic characteristics, clinical profiles, and psychiatric comorbidities were examined. Result: A summary of 179 psychiatric patients who received ECT, 96 (53.6%) are females, and the average age at diagnosis was 42.5 years. The 2-step cluster analysis showed 70 patients in Cluster 1 (39.1%) and 109 patients in Cluster 2 (60.9%). Patients in cluster 1 are more females (61.4%), older (Mean=55.2 years), majority were married (95.7%) and unemployed (88.6%). They reported they had comorbidities medical conditions (55.7%) and less frequent ECT use (Mean=8.7) than patients in Cluster 2. Clusters differences were found on gender (p=0.001), age (<.001), marital status (p<.001), and occupation (p=0.001). In clinical outcomes, significant differences were found on diagnosis (p<.001), had comorbidity medical conditions (p<.001), and use of ECT sessions (p=0.006). Conclusion: This study showed that psychiatric patients receiving ECT are heterogeneous, with different demographic and clinical outcomes. Our study has shown that patients in Cluster 1 are older females, unemployed, with more comorbidities in medical conditions 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.