Nutrient deficiency is a major limitation to the growth, development, and yield of oilseed crops, often resulting in reduced productivity and compromised crop quality. Biostimulants, including plant growth-promoting rhizobacteria (PGPR), humic substances, and microbial inoculants, offer an innovative approach to enhancing nutrient uptake and mitigating the effects of nutrient deficiencies in oilseed crops. This chapter examines the role of biostimulants in improving nutrient acquisition in oilseed crops, with a focus on their ability to mobilize essential nutrients such as nitrogen, phosphorus, and potassium. The underlying mechanisms, including root architecture modification, enhanced enzymatic activity, and improved soil microbial interactions, are discussed in detail. Additionally, the chapter explores how biostimulants modulate hormonal balance and stress signaling pathways to overcome nutrient limitations. The potential of biostimulants as sustainable, eco-friendly tools for optimizing nutrient use efficiency, improving oilseed crops’ resilience, and maintaining productivity under nutrient-limited conditions is also highlighted. Finally, future perspectives on the integration of biostimulants into nutrient management strategies for oilseed crops are proposed.