Rice is a key crop for meeting global food demand and ensuring food security. However, the crop has been facing great problem to combat the weed problem. Synthetic herbicides, pose a severe threat to the human health and agro-ecosystems. Allelochemicals for using as bioherbicides, are powerful tools for biological weed management. The dynamics of plant species in various situations are also determined by allelopathy. Phenolics and momilactones are the most common allelochemicals responsible for herbicidal effects. The allelochemical dispersion is influenced not only by crop variety but also by climatic conditions. This study insights the concepts of allelopathy and allelochemicals, types of allelochemicals, techniques of investigating allelopathic potential in rice, modes of action of allelochemicals, pathways of allelochemical production in rice, biosynthesis of allelochemicals in rice, factors influencing the production of allelochemicals in plants, genetical manipulation to develop allelopathic traits in rice, significance of rice allelopathy in sustainable agriculture etc. Understanding this biological phenomenon may thus aid in the development of new and novel weed-control tactics while allowing farmers to manage weeds in an environmentally friendly manner.