Abiotic stresses, particularly temperature extremes, pose significant challenges to the productivity and sustainability of oilseed crops. In recent years, biostimulants have emerged as promising tools for mitigating the adverse effects of temperature stress, leading to improved growth, development, and yield stability in these crops. This chapter provides a comprehensive overview of the role of biostimulants, such as plant growth-promoting rhizobacteria (PGPR), seaweed extracts, humic substances, and protein hydrolysates, in modulating physiological and molecular responses of oilseed crops under temperature stress. A thorough discussion is held regarding the mechanisms that underlie biostimulant-mediated elevated temperature tolerance, such as upregulated stress-responsive genes, osmolyte buildup, hormonal adjustment, and improved oxidative systems for protection. Furthermore, the chapter stresses how crucial biostimulants serve the purpose of preserving transmembrane stability, boosting absorbance of nutrients, and promoting a plant’s ultimate resistance to shifts in temperature. Amid changing climates, the possible application of biostimulants as environmentally acceptable, sustainable ways to increase oilseed crops’ tolerance for heat is also investigated. In order to secure supplies of food in an ever-changing environment, this chapter culminates by identifying prospective study possibilities, with an especially strong focus on the inclusion of biostimulants throughout crop management approaches.