Tumor location and immunity play important roles in the progression of colorectal cancer (CRC). This study aimed to investigate the differences in the immunosurveillance pattern between rightâ and leftâsided CRC and analyze their association with clinicopathologic features, including mismatch repair (MMR) status. We included surgically resected stage II/III CRC cases and evaluated the immunohistochemical findings of HLA class I, HLA class II, programmed cell deathâligand 1 (PDâL1), PDâ1, CTLAâ4, CD3, CD4, CD8, TIAâ1, Tâbet, GATA3, RORÎłT, Foxp3, and CD163. A total of 117 patients were included in the analyses; of these, 30 and 87 had rightâ and leftâsided cancer, respectively. Tumor immunity varied according to the tumor location in the overall cohort. Analysis of the tumors excluding those with DNA mismatch repair (MMR) deficiency also revealed that tumor immunity differed according to the tumor location. In rightâsided colon cancer (CC), high expression of Foxp3 (PÂ =Â .0055) and TIAâ1 (PÂ =Â .0396) were associated with significantly better diseaseâfree survival (DFS). High CD8 (PÂ =Â .0808) and CD3 (PÂ =Â .0863) expression tended to have better DFS. Furthermore, in leftâsided CRC, only high PDâL1 expression in the stroma (PÂ =Â .0426) was associated with better DFS. In multivariate analysis, high Foxp3 expression in rightâsided CC was an independent prognostic factor for DFS (hazard ratio, 7.6445; 95% confidence interval, 1.2091â150.35; PÂ =Â .0284). In conclusion, the immunosurveillance pattern differs between rightâ and leftâsided CRC, even after adjusting for MMR deficiency.