Cancer epidemiological studies highlight the critical need for identifying better treatment options against cancer. Plants have been widely studied to obtain their efficacy as potent therapeutic agents to treat several diseases, including cancer. Interestingly, some phytocompounds, such as flavonoids, terpenoids, alkaloids, phenolics, and organosulphur compounds [OSCs], have been demonstrating their potential role in combating several pathologies, including the second most devasting disease, cancer, which contributes a significant portion of annual mortality cases. Several in vitro, in vivo, and in silico investigations have recently established remarkable properties of phytocompounds such as antioxidant effects, induction of apoptosis, inhibition of metastasis, autophagy modulation, cell cycle regulation, and chemosensitization that lead to cancer suppression. This underscores the great potential of phytocompounds to contribute as an effective anticancerous drug for the prevention of cancer cases and advancement in cancer research. Therefore, comprehending the complicated mechanism involved in the anticancerous effects of phytocompounds against several carcinomas is crucial to establishing novel therapeutic strategies. Thus, this review tends to summarize the involvement of the most promising classes of phytompounds in cancer management and highlights several clinical trial data that demonstrate significant results in managing diverse carcinomas.