In pursuing sustainable agriculture, Brassica oleracea, a crucial cruciferous crop, encounters formidable challenges posed by biotic stressors. This chapter delves into the intricacies of mitigating such challenges in the context of sustainable farming practices which eventually explores the diverse array of biotic stress factors affecting this vital crop, ranging from insect pests to pathogenic microorganisms; the molecular and physiological responses of Brassica oleracea to biotic stress, shedding light on the underlying mechanisms of resistance and susceptibility; and the strategies employed to bolster resilience against biotic stress. This includes the exploration of natural resistance mechanisms, advancements in breeding techniques, and the integration of environmentally friendly pest management practices. Recognizing the interconnectedness of the agroecosystem emphasizes the importance of holistic approaches that consider the ecological balance within and around Brassica oleracea cultivation. As we navigate the dynamic landscape of agricultural challenges, it serves as a beacon for those seeking sustainable solutions to safeguard Brassica oleracea against the relentless onslaught of biotic stressors.