The oncolytic virus cancer immunotherapy market refers to the use of viruses that selectively infect and kill cancer cells, thereby stimulating an immune response against the tumor. As the oncolytic virus cancer immunotherapy market size is expected to experience significant growth, driven by its growth outlook and market forecast, the industry is poised for substantial industry expansion. The scope of this market encompasses various types of oncolytic viruses, including herpes simplex virus, adenovirus, and vaccinia virus, which are used to treat different types of cancers, such as melanoma, lung cancer, and breast cancer. The current oncolytic virus cancer immunotherapy market size is approximately $1.4 billion, with a projected growth forecast of 25% CAGR from 2026 to 2033, driven by macro drivers such as increasing cancer prevalence, rising demand for immunotherapies, and advancements in technology. Key forces shaping the industry include technology shifts, such as the development of combination therapies, regulations, including FDA approvals, and competitive intensity, with major players investing heavily in research and development.