Oncolytic viruses (OVs) represent a cutting-edge approach to cancer immunotherapy, characterized by their ability to selectively infect and eliminate tumor cells while sparing healthy tissues. Among the diverse OVs, type 1 herpes simplex virus (HSV-1) stands out due to its robust oncolytic activity, genetic malleability, broad cell tropism, and well-documented clinical safety. Advances in genetic engineering have further amplified the therapeutic efficacy of HSV-1 by enhancing tumor specificity, replication efficiency, and immunogenicity. Clinically significant HSV-1-based oncolytic viruses, such as T-VEC and G47 Delta, have gained regulatory approvals for treating melanoma and malignant glioma, respectively, highlighting their transformative potential in cancer therapy. The attenuation strategies employed in most oncolytic HSV-1 (oHSV-1) strains, while ensuring safety, often reduce viral replication and cytotoxicity. To address this limitation, retargeting strategies focusing on HSV-1 glycoproteins (gD, gH/gL, and gB) have been developed. These modifications aim to abolish canonical receptor interactions and achieve tumor-specific targeting through ligand-receptor binding. Recent breakthroughs in understanding HSV entry mechanisms have enabled the creation of fully retargeted HSV vectors with enhanced specificity and efficacy. This review explores the