Cancer, a critical health concern, necessitates safer, more effective treatments. This chapter explores the anticancer potential of traditional Thai plants, which, despite being underresearched, show significant promise. It focuses on bioactive compounds and their efficacy against various cancer types. The chapter categorizes these plants based on their active components and reviews both laboratory and animal studies to understand the underlying mechanisms involved in inhibiting cell growth, inducing cell death, and preventing tumor blood vessel formation. Clinical trials supporting these findings are also highlighted. Given their potential to improve or innovate cancer treatments, Thai plants present encouraging prospects. However, further research is essential to confirm the safety and efficacy of these approaches. These studies suggest that Thai plants could lead to the development of innovative anticancer drugs, signaling potential significant advancements in cancer therapy.