Abstract: Gastric cancer is a globally prevalent malignant tumor and is associated with the highest incidence of malnutrition among various cancer types. Malnutrition significantly affects treatment tolerance, quality of life, and survival outcomes. Standardized nutritional assessment is essential for implementing effective nutritional support therapy. However, current clinical practices face challenges, including nonstandardized screening and assessment procedures, low rates of nutritional intervention, limited awareness among healthcare professionals, and an inadequate outpatient nutritional monitoring system. To systematically promote the standardization of nutritional assessment and management in gastric cancer patients, Gastric Cancer Integrated Nursing Committee of the China Anti-Cancer Association convened a multidisciplinary team of experts. Drawing on the latest evidence from both domestic and international sources and considering the clinical reality in China, they developed the “Expert consensus on comprehensive nutritional assessment of patients with gastriccancer”. This consensus offers recommendations on key aspects, such as the composition and responsibilities of assessment personnel, the optimal timing for assessments, assessment tools and methods, evaluation content, and home-based nutritional monitoring. The goal is to provide scientific, standardized guidance for clinical practitioners to conduct comprehensive nutritional assessments, ultimately improving the nutritional status and clinical outcomes of gastric cancer patients.