Abstract: Gastric cancer has high morbidity and mortality; thus, accurate prognostic predictions before surgery are very important. Radiomics is a new and effective medical image technology that extracts high-dimensional features that are difficult to describe quantitatively from images and provides an evaluation of tumor heterogeneity and functional information on the tumor microenvironment, which has a high value in predicting the prognosis of patients with gastric cancer. This article reviews the application of radiomics for the prognostic prediction of patients with gastric cancer.