We investigated factors contributing to depression in patients with epilepsy. Data were collected from 150 adult patients. Beck Depression Inventory (BDI), Beck Anxiety Inventory, Daily Hassles Scale, Epilepsy Self-Efficacy Scale, Social Support Scale, Stress Coping Style Checklist, and Quality of Life in Epilepsy Inventory 31 (QOLIE-31) were used. The mean BDI score was 13.4 [standard deviation (SD) 9.0]. Abnormal BDI scores were recorded in 93 patients. Six significant predictors of BDI were identified in a stepwise linear regression analysis: level of stress (p < 0.001), social support (p = 0.037), anxiety (p = 0.001), self-efficacy (p < 0.001), employment status (p = 0.021), and age (p = 0.042). Stress accounted for 38.8% of the variance in BDI score, social support accounted for 6.8%, anxiety accounted for 3.9%, and the remaining three variables accounted for an additional 5.2% of the variance (total explained variance = 54.7%).