Objective: The controlling nutritional status (CONUT) score, calculated using serum albumin, total cholesterol, and lymphocyte count, is an effective predictor of post-operative complications (PC) following oncologic resections in gastrointestinal system cancers. This retrospective study aimed to investigate the impact of pre-operative CONUT scores on overall post-operative complications (OPC) in patients with stage I-III gastric cancer (GC) who underwent gastrectomy.