Background <p>Soybean is one the important crop cultivated for its rich source of oils and proteins to feed humans and animals as well as for industrial applications. However, its sustainable production is badly affected by soil poverty insufficient nutrients and various climatic factors. Traditional fertilizers often do not offer lasting nutrient availability and may contribute to deteriorating environmental conditions.</p> Scope <p>In this situation, biochar-based nanofertilizers (BC-NFs), made from agricultural biomass with metal salts, could represent an innovative advance for improving nutrient use efficiency, soil health, and overall crop resilience. This review aims to systematically assess the potential of BC-NFs for sustainable soybean production. The importance of this work lies in placing recent developments on the multi-functional characteristics of BC-NFs. This includes improved nutrient retention and slow-release fertilization, carbon sequestration and greenhouse gas reduction together with soybean productivity as environmental conditions continue to evolve. Even with an increasing interest in BC-NFs, their use in soybean production has not been adequately investigated, nor has there been a crop-specific review to date.</p> Conclusion <p>This review fills this gap by summarizing evidence on BC-NFs, acknowledging research constraints, and presenting future directions to facilitate widespread adoption of BC-NFs as a climate-smart and sustainable nutrient management approach for soybean systems.</p>