Cancer remains one of the leading causes of mortality worldwide, necessitating the development of novel therapeutic approaches. Medicinal plants have emerged as promising sources of anticancer compounds, offering natural alternatives to conventional chemotherapy with potentially fewer side effects. This comprehensive review examines the phytochemical composition and pharmacological mechanisms of various medicinal plants demonstrating significant anticancer properties. The discussion encompasses alkaloids, flavonoids, terpenoids, phenolic compounds, and other bioactive molecules that exhibit cytotoxic, apoptotic, and anti-metastatic activities. Key medicinal plants including Curcuma longa, Camellia sinensis, Vinca species, Taxus species, and Catharanthus roseus are critically analyzed for their therapeutic potential. The review also addresses challenges in phytochemical drug development, including standardization, bioavailability, and clinical translation. Current research trends focusing on nanotechnology applications, combination therapies, and personalized medicine approaches in phytochemical anticancer research are highlighted.