This study investigated whether m5C-related Long non-coding RNAs (lncRNAs) can predict clear cell renal cell carcinoma (ccRCC) patient prognosis. Co-expression and Cox regression analyses identified 9 prognostic lncRNAs, which were closely associated with tumor immune characteristics and immune escape. The model also predicted the sensitivity of drugs, including Entinostat, SB216763, and Sapitinib. In vitro experiments showed that GNG12-AS1 inhibited ccRCC cell proliferation and migration by reducing the activity of the ERK/GSK-3β/β-catenin pathway. Overall, these findings suggest that the 9 m5C-related lncRNAs can accurately predict ccRCC patient prognosis, providing potential applications for clinical and immunotherapy approaches. GNG12-AS1 emerges as a promising prognostic biomarker for predicting survival outcomes in ccRCC, potentially influencing cell migration through the activation of the ERK/GSK-3β/β-catenin signaling pathway.