Background: mitochondrial appropriate function depends on ideal mitochondrial translocation machinery, of which translocase of outer mitochondrial membrane (TOMM) have a vital role in normal functioning cell. Any disturbance in the translocation machinery leads to either tumorigenesis or apoptosis. Aim of the work: This study aimed to investigate the expression of TOMM34 in renal cell carcinoma (RCC). TOMM34 expression was assessed in 42 samples of RCC patients using immunohistochemistry technique. Results: immunohistochemical staining revealed significant accumulation of TOMM34 protein in RCC cases compared to their corresponding non-cancerous renal tissues. TOMM34 protein expression was significantly associated with age and gender categories in contrast to the other clinicopathological features. Conclusion: according to protein expression level this study demonstrated that TOMM34 is a marker of poor outcome in RCC.